{
    "$id": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json",
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "type": "object",
    "title": "Numbas Exam",
    "properties": {
        "allowPrinting": {
            "title": "Allow students to print question content?",
            "type": "boolean"
        },
        "contributors": {
            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/contributors"
        },
        "custom_part_types": {
            "title": "Custom part types used in this exam",
            "items": {
                "type": "object",
                "properties": {
                    "can_be_gap": {
                        "title": "Can this part type be a gap?",
                        "type": "boolean"
                    },
                    "can_be_step": {
                        "title": "Can this part type be a step?",
                        "type": "boolean"
                    },
                    "title": {
                        "title": "Description",
                        "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/html"
                    },
                    "extensions": {
                        "title": "Extensions required by this part type",
                        "items": {
                            "title": "The name of an extension",
                            "type": "string"
                        },
                        "type": "array"
                    },
                    "help_url": {
                        "title": "URL of a help page",
                        "type": "string"
                    },
                    "input_options": {
                        "$comment": "TODO",
                        "title": "Options for the input widget",
                        "type": "object"
                    },
                    "input_widget": {
                        "title": "The input widget used by this part type",
                        "type": "string"
                    },
                    "marking_notes": {
                        "$comment": "TODO",
                        "title": "Marking notes",
                        "items": {},
                        "type": "array"
                    },
                    "marking_script": {
                        "title": "Marking script",
                        "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme_script"
                    },
                    "name": {
                        "title": "Name",
                        "type": "string"
                    },
                    "settings": {
                        "$comment": "TODO",
                        "title": "Definitions of settings for the part type",
                        "items": {},
                        "type": "array"
                    },
                    "short_name": {
                        "title": "A globally unique short name",
                        "type": "string"
                    },
                    "source": {
                        "type": "object",
                        "title": "Information about the source of this custom part type",
                        "properties": {
                            "author": {
                                "title": "Author",
                                "type": "object",
                                "properties": {
                                    "name": {
                                        "type": "string",
                                        "title": "Name"
                                    },
                                    "pk": {
                                        "type": "number",
                                        "title": "ID"
                                    }
                                }
                            },
                            "edit_page": {
                                "title": "URL of the page to edit the custom part type",
                                "type": "string"
                            },
                            "pk": {
                                "title": "ID",
                                "type": "number"
                            }
                        }
                    }
                }
            },
            "type": "array"
        },
        "diagnostic": {
            "title": "Diagnostic mode settings",
            "properties": {
                "customScript": {
                    "title": "Custom diagnostic algorithm",
                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme_script"
                },
                "knowledge_graph": {
                    "title": "Knowledge graph",
                    "properties": {
                        "learning_objectives": {
                            "title": "Learning objectives",
                            "items": {
                                "properties": {
                                    "title": {
                                        "title": "Description",
                                        "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/html"
                                    },
                                    "name": {
                                        "title": "Name",
                                        "type": "string"
                                    }
                                },
                                "type": "object"
                            },
                            "type": "array"
                        },
                        "topics": {
                            "title": "Topics",
                            "items": {
                                "properties": {
                                    "depends_on": {
                                        "title": "Names of topics this topic depends on",
                                        "items": {
                                            "type": "string"
                                        },
                                        "type": "array"
                                    },
                                    "title": {
                                        "title": "Description",
                                        "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/html"
                                    },
                                    "learning_objectives": {
                                        "title": "Names of learning objectives this topic belongs to",
                                        "items": {
                                            "type": "string"
                                        },
                                        "type": "array"
                                    },
                                    "name": {
                                        "title": "Name",
                                        "type": "string"
                                    }
                                },
                                "type": "object"
                            },
                            "type": "array"
                        }
                    },
                    "type": "object"
                },
                "script": {
                    "title": "Diagnostic algorithm",
                    "enum": [
                        "diagnosys",
                        "mastery",
                        "custom"
                    ],
                    "type": "string"
                }
            },
            "type": "object"
        },
        "duration": {
            "title": "The duration of the exam, in seconds",
            "type": "number"
        },
        "extensions": {
            "title": "Extensions required by this exam",
            "items": {
                "title": "The name of an extension",
                "type": "string"
            },
            "type": "array"
        },
        "feedback": {
            "title": "Feedback settings",
            "type": "object",
            "properties": {
                "results_options": {
                    "title": "Results page options",
                    "type": "object",
                    "properties": {
                        "printquestions": {
                            "title": "Show questions in printed results summary?",
                            "type": "boolean"
                        },
                        "printadvice": {
                            "title": "Show advice in printed results summary?",
                            "type": "boolean"
                        }
                    }
                },
                "allowrevealanswer": {
                    "title": "Allow reveal answer?",
                    "type": "boolean"
                },
                "feedbackmessages": {
                    "title": "Feedback messages",
                    "items": {
                        "properties": {
                            "message": {
                                "title": "Message",
                                "type": "string"
                            },
                            "threshold": {
                                "title": "Percentage score (0-100) above which this message is shown.",
                                "type": "number"
                            }
                        },
                        "type": "object"
                    },
                    "type": "array"
                },
                "intro": {
                    "title": "Introduction",
                    "type": "string"
                },
                "showadvicewhen": {
                    "title": "When to show question advice",
                    "enum": [
                        "inreview",
                        "never"
                    ],
                    "type": "string"
                },
                "showexpectedanswerswhen": {
                    "title": "When to reveal expected answers",
                    "enum": [
                        "inreview",
                        "never"
                    ],
                    "type": "string"
                },
                "showactualmarkwhen": {
                    "title": "When to show the current score",
                    "enum": [
                        "always",
                        "oncompletion",
                        "inreview",
                        "never"
                    ],
                    "type": "string"
                },
                "showanswerstatewhen": {
                    "title": "When to show answer state",
                    "enum": [
                        "always",
                        "oncompletion",
                        "inreview",
                        "never"
                    ],
                    "type": "string"
                },
                "showtotalmarkwhen": {
                    "title": "When to show the maximum score",
                    "enum": [
                        "always",
                        "oncompletion",
                        "inreview",
                        "never"
                    ],
                    "type": "string"
                },
                "showpartfeedbackmessageswhen": {
                    "title": "When to show part feedback messages",
                    "enum": [
                        "always",
                        "oncompletion",
                        "inreview",
                        "never"
                    ],
                    "type": "string"
                }
            }
        },
        "metadata": {
            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/item_metadata"
        },
        "name": {
            "title": "The name of the exam",
            "type": "string"
        },
        "navigation": {
            "title": "Navigation settings",
            "properties": {
                "allowregen": {
                    "title": "Allow user to regenerate questions?",
                    "type": "boolean"
                },
                "allowsteps": {
                    "title": "Enable steps?",
                    "type": "boolean"
                },
                "browse": {
                    "title": "Allow jump to any question?",
                    "type": "boolean"
                },
                "navigatemode": {
                    "title": "Question navigation mode",
                    "enum": [
                        "sequence",
                        "menu",
                        "diagnostic"
                    ],
                    "type": "string"
                },
                "onleave": {
                    "title": "On leaving a question",
                    "properties": {
                        "action": {
                            "title": "Action",
                            "enum": [
                                "none",
                                "warnifunattempted",
                                "preventifunattempted"
                            ],
                            "type": "string"
                        },
                        "message": {
                            "title": "Message",
                            "type": "string"
                        }
                    },
                    "type": "object"
                },
                "preventleave": {
                    "title": "Confirm before leaving the exam while it's running?",
                    "type": "boolean"
                },
                "typeendtoleave": {
                    "title": "Require written confirmation before leaving the exam",
                    "type": "boolean"
                },
                "reverse": {
                    "title": "Allow move to previous question?",
                    "type": "boolean"
                },
                "showfrontpage": {
                    "title": "Show front page?",
                    "type": "boolean"
                },
                "enterreviewmodeimmediately": {
                    "title": "Enter review mode immediately after ending the exam?",
                    "type": "boolean"
                },
                "startpassword": {
                    "title": "Password to begin the exam",
                    "type": "string"
                },
                "allowAttemptDownload": {
                    "title": "Allow the student to download their attempt data?",
                    "type": "boolean"
                },
                "downloadEncryptionKey": {
                    "title": "Key for encrypting student data downloads",
                    "type": "string"
                },
                "autoSubmit": {
                    "title": "Automatically submit answers?",
                    "type": "boolean"
                }
            },
            "type": "object"
        },
        "percentPass": {
            "title": "The pass/fail threshold for the student's total score, as a percentage of the available marks.",
            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme"
        },
        "question_groups": {
            "title": "Question groups",
            "items": {
                "properties": {
                    "name": {
                        "title": "Name",
                        "type": "string"
                    },
                    "pickQuestions": {
                        "title": "Number of questions to choose",
                        "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme"
                    },
                    "pickingStrategy": {
                        "title": "Questions to use",
                        "enum": [
                            "all-ordered",
                            "all-shuffled",
                            "random-subset"
                        ],
                        "type": "string"
                    },
                    "questionNames": {
                        "title": "Override question names",
                        "items": {
                            "type": "string"
                        },
                        "type": "array"
                    },
                    "questions": {
                        "title": "Question definitions",
                        "items": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/question"
                        },
                        "type": "array"
                    },
                    "variable_overrides": {
                        "title": "Variable overrides. One item for each question in the group.",
                        "items": {
                            "properties": {
                                "definition": {
                                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                                    "title": "Variable definition"
                                },
                                "name": {
                                    "title": "The name of the variable to override",
                                    "type": "string"
                                }
                            },
                            "type": "object"
                        },
                        "type": "array"
                    }
                },
                "type": "object"
            },
            "type": "array"
        },
        "resources": {
            "title": "Resource files associated with the exam",
            "items": {
                "prefixItems": [
                    {
                        "title": "Name",
                        "type": "string"
                    },
                    {
                        "title": "Path",
                        "type": "string"
                    }
                ],
                "type": "array"
            },
            "type": "array"
        },
        "showQuestionGroupNames": {
            "title": "Should the names of question groups be shown to the student?",
            "type": "boolean"
        },
        "showstudentname": {
            "title": "Show the student's name?",
            "type": "boolean"
        },
        "shuffleQuestionGroups": {
            "title": "If true, the question groups appear in random order.",
            "type": "boolean"
        },
        "timing": {
            "title": "Timing settings",
            "properties": {
                "allowPause": {
                    "title": "Allow pausing?",
                    "type": "boolean"
                },
                "timedwarning": {
                    "title": "5 minutes before timeout",
                    "properties": {
                        "action": {
                            "title": "Action",
                            "enum": [
                                "none",
                                "warn"
                            ],
                            "type": "string"
                        },
                        "message": {
                            "title": "Message",
                            "type": "string"
                        }
                    },
                    "type": "object"
                },
                "timeout": {
                    "title": "On timeout",
                    "properties": {
                        "action": {
                            "title": "Action",
                            "enum": [
                                "none",
                                "warn"
                            ],
                            "type": "string"
                        },
                        "message": {
                            "title": "Message",
                            "type": "string"
                        }
                    },
                    "type": "object"
                }
            },
            "type": "object"
        }
    },
    "$defs": {
        "contributors": {
            "type": "array",
            "title": "Contributors to this item",
            "items": {
                "properties": {
                    "name": {
                        "title": "The contributor's name",
                        "type": "string"
                    },
                    "profile_url": {
                        "title": "Profile URL on the Numbas editor",
                        "type": "string"
                    }
                },
                "type": "object"
            }
        },
        "html": {
            "title": "HTML code",
            "type": "string"
        },
        "item_metadata": {
            "title": "Item metadata",
            "properties": {
                "title": {
                    "title": "A description of the item.",
                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/html"
                },
                "licence": {
                    "title": "The licence under which the item is distributed.",
                    "type": "string"
                }
            },
            "type": "object"
        },
        "partPath": {
            "title": "The path to a question part",
            "type": "string"
        },
        "custom_part_type_settings": {
            "title": "Custom part type settings",
            "type": "object"
        },
        "tex": {
            "title": "LaTeX code",
            "type": "string"
        },
        "jme_script": {
            "title": "JME notes",
            "type": "string"
        },
        "jme": {
            "title": "JME code",
            "oneOf": [
                {
                    "type": "string"
                },
                {
                    "type": "number"
                }
            ]
        },
        "question": {
            "title": "Question",
            "type": "object",
            "properties": {
                "advice": {
                    "title": "Advice",
                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/html"
                },
                "builtin_constants": {
                    "additionalProperties": {
                        "type": "boolean"
                    },
                    "title": "Which built-in constants are enabled",
                    "type": "object"
                },
                "constants": {
                    "title": "Constants",
                    "items": {
                        "properties": {
                            "name": {
                                "title": "Name",
                                "type": "string"
                            },
                            "tex": {
                                "title": "LaTeX rendering",
                                "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/tex"
                            },
                            "value": {
                                "title": "JME value",
                                "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme"
                            }
                        },
                        "type": "object"
                    },
                    "type": "array"
                },
                "extensions": {
                    "title": "Extensions required by this question",
                    "items": {
                        "title": "The name of an extension",
                        "type": "string"
                    },
                    "type": "array"
                },
                "metadata": {
                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/item_metadata"
                },
                "name": {
                    "title": "Name",
                    "type": "string"
                },
                "rulesets": {
                    "additionalProperties": {
                        "type": "array",
                        "items": {
                            "type": "string"
                        }
                    },
                    "title": "Rulesets",
                    "type": "object"
                },
                "statement": {
                    "title": "Statement",
                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/html"
                },
                "tags": {
                    "title": "Tags",
                    "items": {
                        "type": "string"
                    },
                    "type": "array"
                },
                "variables": {
                    "title": "Variable definitions",
                    "type": "object",
                    "additionalProperties": {
                        "type": "object",
                        "properties": {
                            "can_override": {
                                "title": "Can an exam override the value of this variable?",
                                "type": "boolean"
                            },
                            "definition": {
                                "title": "Definition",
                                "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme"
                            },
                            "description": {
                                "title": "Description",
                                "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/html"
                            },
                            "group": {
                                "oneOf": [
                                    {
                                        "type": "string"
                                    },
                                    {
                                        "type": "null"
                                    }
                                ],
                                "title": "Group"
                            },
                            "name": {
                                "title": "Name, or comma-separated list of names",
                                "type": "string"
                            },
                            "templateType": {
                                "title": "Data type template",
                                "enum": [
                                    "anything",
                                    "number",
                                    "range",
                                    "randrange",
                                    "string",
                                    "long plain string",
                                    "long string",
                                    "list of numbers",
                                    "list of strings",
                                    "json"
                                ],
                                "type": "string"
                            }
                        }
                    }
                },
                "variablesTest": {
                    "type": "object",
                    "title": "Variable testing",
                    "properties": {
                        "condition": {
                            "type": "string",
                            "title": "Condition"
                        },
                        "maxRuns": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Maximum number of runs"
                        }
                    }
                },
                "ungrouped_variables": {
                    "type": "array",
                    "title": "Names of ungrouped variables",
                    "items": {
                        "type": "string"
                    }
                },
                "variable_groups": {
                    "type": "array",
                    "title": "Variable groups",
                    "items": {
                        "type": "object",
                        "properties": {
                            "name": {
                                "type": "string",
                                "title": "Name"
                            },
                            "variables": {
                                "type": "array",
                                "title": "Variables",
                                "items": {
                                    "type": "string"
                                }
                            }
                        }
                    }
                },
                "functions": {
                    "type": "object",
                    "title": "Functions",
                    "additionalProperties": {
                        "type": "object",
                        "properties": {
                            "parameters": {
                                "type": "array",
                                "title": "Parameters",
                                "items": {
                                    "type": "object",
                                    "properties": {
                                        "name": {
                                            "type": "string",
                                            "title": "Name"
                                        },
                                        "type": {
                                            "type": "string",
                                            "title": "Type signature"
                                        }
                                    }
                                }
                            },
                            "type": {
                                "type": "string",
                                "title": "Type"
                            },
                            "language": {
                                "type": "string",
                                "title": "Language",
                                "enum": [
                                    "jme",
                                    "javascript"
                                ]
                            },
                            "definition": {
                                "type": "string",
                                "title": "Definition"
                            }
                        }
                    }
                },
                "preamble": {
                    "type": "object",
                    "title": "Preamble",
                    "properties": {
                        "js": {
                            "type": "string",
                            "title": "JavaScript preamble"
                        },
                        "css": {
                            "type": "string",
                            "title": "CSS preamble"
                        }
                    }
                },
                "parts": {
                    "type": "array",
                    "title": "Parts",
                    "items": {
                        "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/part"
                    }
                },
                "partsMode": {
                    "type": "string",
                    "title": "Parts mode",
                    "enum": [
                        "all",
                        "explore"
                    ]
                },
                "maxMarks": {
                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                    "title": "Maximum mark"
                },
                "objectives": {
                    "type": "array",
                    "title": "Objectives",
                    "items": {
                        "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/scorebin"
                    }
                },
                "penalties": {
                    "type": "array",
                    "title": "Penalties",
                    "items": {
                        "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/scorebin"
                    }
                },
                "objectiveVisibility": {
                    "type": "string",
                    "title": "Show objectives",
                    "enum": [
                        "always",
                        "when-active"
                    ]
                },
                "penaltyVisibility": {
                    "type": "string",
                    "title": "Show penalties",
                    "enum": [
                        "always",
                        "when-active"
                    ]
                }
            }
        },
        "scorebin": {
            "title": "Score bin",
            "type": "object",
            "properties": {
                "name": {
                    "type": "string",
                    "title": "Name"
                },
                "limit": {
                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                    "title": "Limit"
                }
            }
        },
        "part": {
            "title": "Part",
            "type": "object",
            "properties": {
                "useCustomName": {
                    "type": "boolean",
                    "title": "Use a custom name?"
                },
                "customName": {
                    "type": "string",
                    "title": "Custom name"
                },
                "marks": {
                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                    "title": "Marks"
                },
                "scripts": {
                    "type": "object",
                    "title": "Custom JavaScript",
                    "properties": {
                        "constructor": {
                            "type": "object",
                            "title": "When the part is created",
                            "properties": {
                                "script": {
                                    "type": "string",
                                    "title": "Script"
                                },
                                "order": {
                                    "type": "string",
                                    "const": "after"
                                }
                            }
                        },
                        "mark": {
                            "type": "object",
                            "title": "Mark student's answer",
                            "properties": {
                                "script": {
                                    "type": "string",
                                    "title": "Script"
                                },
                                "order": {
                                    "type": "string",
                                    "title": "This script runs...",
                                    "enum": [
                                        "instead of",
                                        "after",
                                        "before"
                                    ]
                                }
                            }
                        },
                        "validate": {
                            "type": "object",
                            "title": "Validate student's answer",
                            "properties": {
                                "script": {
                                    "type": "string",
                                    "title": "Script"
                                },
                                "order": {
                                    "type": "string",
                                    "title": "This script runs...",
                                    "enum": [
                                        "instead of",
                                        "after",
                                        "before"
                                    ]
                                }
                            }
                        }
                    }
                },
                "customMarkingAlgorithm": {
                    "type": "string",
                    "title": "Custom marking algorithm"
                },
                "extendBaseMarkingAlgorithm": {
                    "type": "boolean",
                    "title": "Extend base marking algorithm?"
                },
                "unitTests": {
                    "type": "array",
                    "title": "Unit tests",
                    "items": {
                        "type": "object",
                        "properties": {
                            "variables": {
                                "type": "array",
                                "title": "Variables",
                                "items": {
                                    "type": "object",
                                    "properties": {
                                        "name": {
                                            "type": "string",
                                            "title": "Name"
                                        },
                                        "value": {
                                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                                            "title": "Value"
                                        }
                                    }
                                }
                            },
                            "name": {
                                "type": "string",
                                "title": "Name"
                            },
                            "answer": {
                                "type": "object",
                                "title": "Answer",
                                "properties": {
                                    "valid": {
                                        "type": "boolean",
                                        "title": "Answer is valid?"
                                    },
                                    "value": {
                                        "type": "object",
                                        "title": "Value"
                                    }
                                }
                            },
                            "notes": {
                                "type": "array",
                                "title": "Notes",
                                "items": {
                                    "type": "object",
                                    "properties": {
                                        "name": {
                                            "type": "string",
                                            "title": "Name"
                                        },
                                        "expected": {
                                            "type": "object",
                                            "title": "Expected values",
                                            "properties": {
                                                "value": {
                                                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                                                    "title": "Value"
                                                },
                                                "messages": {
                                                    "type": "array",
                                                    "title": "Feedback messages",
                                                    "items": {
                                                        "type": "string"
                                                    }
                                                },
                                                "warnings": {
                                                    "type": "array",
                                                    "title": "Warnings",
                                                    "items": {
                                                        "type": "string"
                                                    }
                                                },
                                                "error": {
                                                    "type": "string",
                                                    "title": "Error"
                                                },
                                                "valid": {
                                                    "type": "boolean",
                                                    "title": "Answer is valid?"
                                                },
                                                "credit": {
                                                    "type": "number",
                                                    "title": "Credit"
                                                }
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                },
                "showCorrectAnswer": {
                    "type": "boolean",
                    "title": "Show correct answer on reveal?"
                },
                "showFeedbackIcon": {
                    "type": "boolean",
                    "title": "Show score feedback icon?"
                },
                "variableReplacements": {
                    "type": "array",
                    "title": "Variable replacements",
                    "items": {
                        "type": "object",
                        "properties": {
                            "variable": {
                                "type": "string",
                                "title": "Variable to replace"
                            },
                            "part": {
                                "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/partPath",
                                "title": "Path of the part to use"
                            },
                            "must_go_first": {
                                "type": "boolean",
                                "title": "Must be answered?"
                            }
                        }
                    }
                },
                "variableReplacementStrategy": {
                    "type": "string",
                    "title": "Variable replacement strategy",
                    "enum": [
                        "originalfirst",
                        "alwaysreplace"
                    ]
                },
                "nextParts": {
                    "type": "array",
                    "title": "Next part options",
                    "items": {
                        "type": "object",
                        "properties": {
                            "label": {
                                "type": "string",
                                "title": "Label (`rawLabel`, or the other part's name is used if `rawLabel` is empty)"
                            },
                            "rawLabel": {
                                "type": "string",
                                "title": "Raw label"
                            },
                            "otherPart": {
                                "type": "number",
                                "title": "Next part"
                            },
                            "variableReplacements": {
                                "type": "array",
                                "title": "Variable replacements",
                                "items": {
                                    "type": "object",
                                    "properties": {
                                        "variable": {
                                            "type": "string",
                                            "title": "Variable to replace"
                                        },
                                        "definition": {
                                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                                            "title": "Definition"
                                        }
                                    }
                                }
                            },
                            "availabilityCondition": {
                                "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                                "title": "Availability condition"
                            },
                            "penalty": {
                                "type": "string",
                                "title": "Penalty to apply when visited"
                            },
                            "penaltyAmount": {
                                "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                                "title": "Amount of penalty"
                            },
                            "lockAfterLeaving": {
                                "type": "boolean",
                                "title": "Lock this part?"
                            }
                        }
                    }
                },
                "suggestGoingBack": {
                    "type": "boolean",
                    "title": "Suggest going back to the previous part?"
                },
                "adaptiveMarkingPenalty": {
                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                    "title": "Penalty when adaptive marking is used"
                },
                "exploreObjective": {
                    "oneOf": [
                        {
                            "type": "string"
                        },
                        {
                            "type": "null"
                        }
                    ],
                    "title": "Score counts towards objective"
                },
                "prompt": {
                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/html",
                    "title": "Prompt"
                },
                "stepsPenalty": {
                    "type": "number",
                    "title": "Penalty for revealing steps"
                },
                "steps": {
                    "type": "array",
                    "title": "Steps",
                    "items": {
                        "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/part"
                    }
                },
                "alternatives": {
                    "type": "array",
                    "title": "Alternative answers",
                    "items": {
                        "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/part"
                    }
                },
                "alternativeFeedbackMessage": {
                    "type": "string",
                    "title": "Message if this alternative is used"
                },
                "useAlternativeFeedback": {
                    "type": "boolean",
                    "title": "Show all feedback?"
                }
            },
            "anyOf": [
                {
                    "title": "Gap-fill",
                    "properties": {
                        "type": {
                            "type": "string",
                            "const": "gapfill"
                        },
                        "gaps": {
                            "type": "array",
                            "title": "Gaps",
                            "items": {
                                "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/part"
                            }
                        },
                        "sortAnswers": {
                            "type": "boolean",
                            "title": "Sort student's answers before marking?"
                        }
                    }
                },
                {
                    "title": "Information only",
                    "properties": {
                        "type": {
                            "type": "string",
                            "const": "information"
                        }
                    }
                },
                {
                    "title": "Extension",
                    "properties": {
                        "type": {
                            "type": "string",
                            "const": "extension"
                        }
                    }
                },
                {
                    "title": "Mathematical expression",
                    "properties": {
                        "type": {
                            "type": "string",
                            "const": "jme"
                        },
                        "answer": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Expected answer"
                        },
                        "showPreview": {
                            "type": "boolean",
                            "title": "Show preview of student's answer?"
                        },
                        "checkingType": {
                            "type": "string",
                            "title": "Checking type",
                            "enum": [
                                "absdiff",
                                "reldiff",
                                "dp",
                                "sigfig"
                            ]
                        },
                        "checkingAccuracy": {
                            "type": "number",
                            "title": "Checking accuracy"
                        },
                        "failureRate": {
                            "type": "number",
                            "title": "Maximum no. of failures"
                        },
                        "vsetRangePoints": {
                            "type": "number",
                            "title": "Points to check"
                        },
                        "vsetRange": {
                            "type": "array",
                            "title": "Checking range",
                            "prefixItems": [
                                {
                                    "type": "number",
                                    "title": "Start"
                                },
                                {
                                    "type": "number",
                                    "title": "End"
                                }
                            ]
                        },
                        "checkVariableNames": {
                            "type": "boolean",
                            "title": "Warn if student uses an unexpected variable name?"
                        },
                        "singleLetterVariables": {
                            "type": "boolean",
                            "title": "Force single letter variable names?"
                        },
                        "allowUnknownFunctions": {
                            "type": "boolean",
                            "title": "Allow unknown function names?"
                        },
                        "implicitFunctionComposition": {
                            "type": "boolean",
                            "title": "Use implicit function composition?"
                        },
                        "caseSensitive": {
                            "type": "boolean",
                            "title": "Expression is case-sensitive?"
                        },
                        "maxlength": {
                            "type": "object",
                            "title": "Maximum length restriction",
                            "properties": {
                                "length": {
                                    "type": "number",
                                    "title": "Maximum length"
                                },
                                "partialCredit": {
                                    "type": "number",
                                    "title": "Partial credit for long answer"
                                },
                                "message": {
                                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/html",
                                    "title": "Warning message"
                                }
                            }
                        },
                        "minlength": {
                            "type": "object",
                            "title": "Minimum length restriction",
                            "properties": {
                                "length": {
                                    "type": "number",
                                    "title": "Minimum length"
                                },
                                "partialCredit": {
                                    "type": "number",
                                    "title": "Partial credit for short answer"
                                },
                                "message": {
                                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/html",
                                    "title": "Warning message"
                                }
                            }
                        },
                        "musthave": {
                            "type": "object",
                            "title": "Required strings",
                            "properties": {
                                "strings": {
                                    "type": "array",
                                    "title": "Required strings",
                                    "items": {
                                        "type": "string"
                                    }
                                },
                                "showStrings": {
                                    "type": "boolean",
                                    "title": "Show required strings?"
                                },
                                "partialCredit": {
                                    "type": "number",
                                    "title": "Partial credit for not using all required strings"
                                },
                                "message": {
                                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/html",
                                    "title": "Warning message"
                                }
                            }
                        },
                        "notallowed": {
                            "type": "object",
                            "title": "Forbidden strings",
                            "properties": {
                                "strings": {
                                    "type": "array",
                                    "title": "Forbidden strings",
                                    "items": {
                                        "type": "string"
                                    }
                                },
                                "showStrings": {
                                    "type": "boolean",
                                    "title": "Show forbidden strings?"
                                },
                                "partialCredit": {
                                    "type": "number",
                                    "title": "Partial credit for using any forbidden string"
                                },
                                "message": {
                                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/html",
                                    "title": "Warning message"
                                }
                            }
                        },
                        "mustmatchpattern": {
                            "type": "object",
                            "title": "Pattern student's answer must match",
                            "properties": {
                                "pattern": {
                                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                                    "title": "Pattern student's answer must match"
                                },
                                "partialCredit": {
                                    "type": "number",
                                    "title": "Partial credit for not matching pattern"
                                },
                                "message": {
                                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/html",
                                    "title": "Warning message"
                                },
                                "nameToCompare": {
                                    "type": "string",
                                    "title": "Part of expression to mark"
                                }
                            }
                        },
                        "valuegenerators": {
                            "type": "array",
                            "title": "Variable value generators",
                            "items": {
                                "type": "object",
                                "properties": {
                                    "name": {
                                        "type": "string",
                                        "title": "Name"
                                    },
                                    "value": {
                                        "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                                        "title": "Value generator"
                                    }
                                }
                            }
                        }
                    }
                },
                {
                    "title": "Number entry",
                    "properties": {
                        "type": {
                            "type": "string",
                            "const": "numberentry"
                        },
                        "minValue": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Minimum accepted value"
                        },
                        "maxValue": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Maximum accepted value"
                        },
                        "correctAnswerFraction": {
                            "type": "boolean",
                            "title": "Display the correct answer as a fraction?"
                        },
                        "allowFractions": {
                            "type": "boolean",
                            "title": "Allow the student to enter a fraction?"
                        },
                        "mustBeReduced": {
                            "type": "boolean",
                            "title": "Must the fraction be reduced?"
                        },
                        "mustBeReducedPC": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Partial credit for unreduced fraction"
                        },
                        "precisionType": {
                            "type": "string",
                            "title": "Precision restriction",
                            "enum": [
                                "none",
                                "dp",
                                "sigfig"
                            ]
                        },
                        "precision": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Precision"
                        },
                        "precisionPartialCredit": {
                            "type": "number",
                            "title": "Partial credit for wrong precision"
                        },
                        "strictPrecision": {
                            "type": "boolean",
                            "title": "Require trailing zeros?"
                        },
                        "showPrecisionHint": {
                            "type": "boolean",
                            "title": "Show precision restriction hint?"
                        },
                        "showFractionHint": {
                            "type": "boolean",
                            "title": "Show fraction input hint?"
                        },
                        "notationStyles": {
                            "type": "array",
                            "title": "Allowed notation",
                            "items": {
                                "type": "string"
                            }
                        },
                        "correctAnswerStyle": {
                            "type": "string",
                            "title": "Correct answer style"
                        },
                        "displayAnswer": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "The value to be displayed as the expected answer"
                        }
                    }
                },
                {
                    "title": "Matrix entry",
                    "properties": {
                        "type": {
                            "type": "string",
                            "const": "matrix"
                        },
                        "correctAnswer": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Correct answer"
                        },
                        "correctAnswerFractions": {
                            "type": "boolean",
                            "title": "Display numbers in the correct answer as fractions?"
                        },
                        "numRows": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Number of rows"
                        },
                        "numColumns": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Number of columns"
                        },
                        "allowResize": {
                            "type": "boolean",
                            "title": "Allow student to change size of matrix?"
                        },
                        "tolerance": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Margin of error allowed in each cell"
                        },
                        "markPerCell": {
                            "type": "boolean",
                            "title": "Gain marks for each correct cell?"
                        },
                        "allowFractions": {
                            "type": "boolean",
                            "title": "Allow the student to enter fractions?"
                        },
                        "minColumns": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Minimum number of columns"
                        },
                        "maxColumns": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Maximum number of columns"
                        },
                        "minRows": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Minimum number of rows"
                        },
                        "maxRows": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Maximum number of rows"
                        },
                        "precisionType": {
                            "type": "string",
                            "title": "Precision restriction",
                            "enum": [
                                "none",
                                "dp",
                                "sigfig"
                            ]
                        },
                        "precision": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Precision"
                        },
                        "precisionPartialCredit": {
                            "type": "number",
                            "title": "Partial credit for wrong precision"
                        },
                        "strictPrecision": {
                            "type": "boolean",
                            "title": "Require trailing zeros?"
                        }
                    }
                },
                {
                    "title": "Match text pattern",
                    "properties": {
                        "type": {
                            "type": "string",
                            "const": "patternmatch"
                        },
                        "answer": {
                            "type": "string",
                            "title": "Answer pattern"
                        },
                        "displayAnswer": {
                            "type": "string",
                            "title": "Display answer"
                        },
                        "caseSensitive": {
                            "type": "boolean",
                            "title": "Must the answer be in the correct case?"
                        },
                        "allowEmpty": {
                            "type": "boolean",
                            "title": "Allow the student to submit an empty answer?"
                        },
                        "partialCredit": {
                            "type": "number",
                            "title": "Partial credit for answer not matching case"
                        },
                        "matchMode": {
                            "type": "string",
                            "title": "Match test",
                            "enum": [
                                "regex",
                                "exact"
                            ]
                        }
                    }
                },
                {
                    "title": "Choose one from a list",
                    "properties": {
                        "type": {
                            "type": "string",
                            "const": "1_n_2"
                        },
                        "shuffleChoices": {
                            "type": "boolean",
                            "title": "Shuffle order of choices?"
                        },
                        "displayType": {
                            "type": "string",
                            "title": "Selection type",
                            "enum": [
                                "radiogroup",
                                "dropdownlist"
                            ]
                        },
                        "displayColumns": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Number of display columns"
                        },
                        "showCellAnswerState": {
                            "type": "boolean",
                            "title": "Show choice feedback state?"
                        },
                        "choices": {
                            "title": "Choices",
                            "oneOf": [
                                {
                                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme"
                                },
                                {
                                    "type": "array",
                                    "items": {
                                        "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/html"
                                    }
                                }
                            ]
                        },
                        "matrix": {
                            "title": "Marking matrix",
                            "oneOf": [
                                {
                                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme"
                                },
                                {
                                    "type": "array",
                                    "items": {
                                        "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme"
                                    }
                                }
                            ]
                        },
                        "distractors": {
                            "title": "Distractors",
                            "type": "array",
                            "items": {
                                "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/html"
                            }
                        }
                    }
                },
                {
                    "title": "Choose several from a list",
                    "properties": {
                        "type": {
                            "type": "string",
                            "const": "m_n_2"
                        },
                        "minMarks": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Minimum marks"
                        },
                        "maxMarks": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Maximum marks"
                        },
                        "shuffleChoices": {
                            "type": "boolean",
                            "title": "Shuffle order of choices?"
                        },
                        "displayType": {
                            "type": "string",
                            "title": "Selection type",
                            "const": "checkbox"
                        },
                        "displayColumns": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Number of display columns"
                        },
                        "minAnswers": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Minimum answers"
                        },
                        "maxAnswers": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Maximum answers"
                        },
                        "warningType": {
                            "type": "string",
                            "title": "What to do if wrong number of answers selected",
                            "enum": [
                                "none",
                                "warn",
                                "prevent"
                            ]
                        },
                        "showCellAnswerState": {
                            "type": "boolean",
                            "title": "Show choice feedback state?"
                        },
                        "markingMethod": {
                            "type": "string",
                            "title": "Marking method",
                            "enum": [
                                "sum ticked cells",
                                "score per matched cell",
                                "all-or-nothing"
                            ]
                        },
                        "choices": {
                            "title": "Choices",
                            "oneOf": [
                                {
                                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme"
                                },
                                {
                                    "type": "array",
                                    "items": {
                                        "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/html"
                                    }
                                }
                            ]
                        },
                        "matrix": {
                            "title": "Marking matrix",
                            "oneOf": [
                                {
                                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme"
                                },
                                {
                                    "type": "array",
                                    "items": {
                                        "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme"
                                    }
                                }
                            ]
                        },
                        "distractors": {
                            "title": "Distractors",
                            "type": "array",
                            "items": {
                                "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/html"
                            }
                        }
                    }
                },
                {
                    "title": "Match choices with answers",
                    "properties": {
                        "type": {
                            "type": "string",
                            "const": "m_n_x"
                        },
                        "minMarks": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Minimum marks"
                        },
                        "maxMarks": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Maximum marks"
                        },
                        "shuffleChoices": {
                            "type": "boolean",
                            "title": "Shuffle order of choices?"
                        },
                        "shuffleAnswers": {
                            "type": "boolean",
                            "title": "Shuffle order of answers?"
                        },
                        "displayType": {
                            "type": "string",
                            "title": "Selection type",
                            "enum": [
                                "radiogroup",
                                "checkbox"
                            ]
                        },
                        "displayColumns": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Number of display columns"
                        },
                        "minAnswers": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Minimum answers"
                        },
                        "maxAnswers": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                            "title": "Maximum answers"
                        },
                        "warningType": {
                            "type": "string",
                            "title": "What to do if wrong number of answers selected",
                            "enum": [
                                "none",
                                "warn",
                                "prevent"
                            ]
                        },
                        "showCellAnswerState": {
                            "type": "boolean",
                            "title": "Show choice feedback state?"
                        },
                        "markingMethod": {
                            "type": "string",
                            "title": "Marking method",
                            "enum": [
                                "sum ticked cells",
                                "score per matched cell",
                                "all-or-nothing"
                            ]
                        },
                        "choices": {
                            "title": "Choices",
                            "oneOf": [
                                {
                                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme"
                                },
                                {
                                    "type": "array",
                                    "items": {
                                        "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/html"
                                    }
                                }
                            ]
                        },
                        "choicesHeader": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/html",
                            "title": "Text before choices"
                        },
                        "answers": {
                            "title": "Answers",
                            "oneOf": [
                                {
                                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme"
                                },
                                {
                                    "type": "array",
                                    "items": {
                                        "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/html"
                                    }
                                }
                            ]
                        },
                        "answersHeader": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/html",
                            "title": "Text above answers"
                        },
                        "matrix": {
                            "title": "Marking matrix",
                            "oneOf": [
                                {
                                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme"
                                },
                                {
                                    "type": "array",
                                    "items": {
                                        "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme"
                                    }
                                }
                            ]
                        },
                        "layout": {
                            "title": "Layout",
                            "type": "object",
                            "properties": {
                                "name": {
                                    "title": "Layout type",
                                    "type": "string",
                                    "enum": [
                                        "all",
                                        "lowertriangle",
                                        "strictlowertriangle",
                                        "uppertriangle",
                                        "strictuppertriangle",
                                        "expression"
                                    ]
                                },
                                "expression": {
                                    "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/jme",
                                    "title": "Custom layout expression"
                                }
                            }
                        }
                    }
                },
                {
                    "title": "Custom",
                    "properties": {
                        "type": {
                            "type": "string"
                        },
                        "settings": {
                            "$ref": "https://www.numbas.org.uk/schemas/exam_schema.9.0.json#/$defs/custom_part_type_settings",
                            "title": "Settings"
                        }
                    }
                }
            ]
        }
    }
}