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only rich display outputs have metadata...
only rich display outputs have metadata even affects v3, which had some bugs that didn't describe actual js behavior
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nbformat.v3.schema.json
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{
"$schema": "http://json-schema.org/draft-04/schema#",
"description": "IPython Notebook v3.0 JSON schema.",
"type": "object",
"additionalProperties": false,
"required": ["metadata", "nbformat_minor", "nbformat", "worksheets"],
"properties": {
"metadata": {
"description": "Notebook root-level metadata.",
"type": "object",
"additionalProperties": true,
"properties": {
"kernel_info": {
"description": "Kernel information.",
"type": "object",
"required": ["name", "language"],
"properties": {
"name": {
"description": "Name of the kernel specification.",
"type": "string"
},
"language": {
"description": "The programming language which this kernel runs.",
"type": "string"
},
"codemirror_mode": {
"description": "The codemirror mode to use for code in this language.",
"type": "string"
}
}
},
"signature": {
"description": "Hash of the notebook.",
"type": "string"
}
}
},
"nbformat_minor": {
"description": "Notebook format (minor number). Incremented for backward compatible changes to the notebook format.",
"type": "integer",
"minimum": 0
},
"nbformat": {
"description": "Notebook format (major number). Incremented between backwards incompatible changes to the notebook format.",
"type": "integer",
"minimum": 3,
"maximum": 3
},
"orig_nbformat": {
"description": "Original notebook format (major number) before converting the notebook between versions.",
"type": "integer",
"minimum": 1
},
"worksheets" : {
"description": "Array of worksheets",
"type": "array",
"items": {"$ref": "#/definitions/worksheet"}
}
},
"definitions": {
"worksheet": {
"additionalProperties": false,
"required" : ["cells"],
"properties":{
"cells": {
"description": "Array of cells of the current notebook.",
"type": "array",
"items": {
"type": "object",
"oneOf": [
{"$ref": "#/definitions/raw_cell"},
{"$ref": "#/definitions/markdown_cell"},
{"$ref": "#/definitions/heading_cell"},
{"$ref": "#/definitions/code_cell"}
]
}
},
"metadata": {
"type": "object",
"description": "metadata of the current worksheet"
}
}
},
"raw_cell": {
"description": "Notebook raw nbconvert cell.",
"type": "object",
"additionalProperties": false,
"required": ["cell_type", "source"],
"properties": {
"cell_type": {
"description": "String identifying the type of cell.",
"enum": ["raw"]
},
"metadata": {
"description": "Cell-level metadata.",
"type": "object",
"additionalProperties": true,
"properties": {
"format": {
"description": "Raw cell metadata format for nbconvert.",
"type": "string"
},
"name": {"$ref": "#/definitions/misc/metadata_name"},
"tags": {"$ref": "#/definitions/misc/metadata_tags"}
}
},
"source": {"$ref": "#/definitions/misc/source"}
}
},
"markdown_cell": {
"description": "Notebook markdown cell.",
"type": "object",
"additionalProperties": false,
"required": ["cell_type", "source"],
"properties": {
"cell_type": {
"description": "String identifying the type of cell.",
"enum": ["markdown", "html"]
},
"metadata": {
"description": "Cell-level metadata.",
"type": "object",
"properties": {
"name": {"$ref": "#/definitions/misc/metadata_name"},
"tags": {"$ref": "#/definitions/misc/metadata_tags"}
},
"additionalProperties": true
},
"source": {"$ref": "#/definitions/misc/source"}
}
},
"heading_cell": {
"description": "Notebook heading cell.",
"type": "object",
"additionalProperties": false,
"required": ["cell_type", "source", "level"],
"properties": {
"cell_type": {
"description": "String identifying the type of cell.",
"enum": ["heading"]
},
"metadata": {
"description": "Cell-level metadata.",
"type": "object",
"additionalProperties": true
},
"source": {"$ref": "#/definitions/misc/source"},
"level": {
"description": "Level of heading cells.",
"type": "integer",
"minimum": 1
}
}
},
"code_cell": {
"description": "Notebook code cell.",
"type": "object",
"additionalProperties": false,
"required": ["cell_type", "input", "outputs", "language"],
"properties": {
"cell_type": {
"description": "String identifying the type of cell.",
"enum": ["code"]
},
"language": {
"description": "The cell's language (always Python)",
"type": "string"
},
"collapsed": {
"description": "Whether the cell is collapsed/expanded.",
"type": "boolean"
},
"metadata": {
"description": "Cell-level metadata.",
"type": "object",
"additionalProperties": true
},
"input": {"$ref": "#/definitions/misc/source"},
"outputs": {
"description": "Execution, display, or stream outputs.",
"type": "array",
"items": {"$ref": "#/definitions/output"}
},
"prompt_number": {
"description": "The code cell's prompt number. Will be null if the cell has not been run.",
"type": ["integer", "null"],
"minimum": 0
}
}
},
"output": {
"type": "object",
"oneOf": [
{"$ref": "#/definitions/pyout"},
{"$ref": "#/definitions/display_data"},
{"$ref": "#/definitions/stream"},
{"$ref": "#/definitions/pyerr"}
]
},
"pyout": {
"description": "Result of executing a code cell.",
"type": "object",
"additionalProperties": false,
"required": ["output_type", "prompt_number"],
"properties": {
"output_type": {
"description": "Type of cell output.",
"enum": ["pyout"]
},
"prompt_number": {
"description": "A result's prompt number.",
"type": ["integer"],
"minimum": 0
},
"text": {"$ref": "#/definitions/misc/multiline_string"},
"latex": {"$ref": "#/definitions/misc/multiline_string"},
"png": {"$ref": "#/definitions/misc/multiline_string"},
"jpeg": {"$ref": "#/definitions/misc/multiline_string"},
"svg": {"$ref": "#/definitions/misc/multiline_string"},
"html": {"$ref": "#/definitions/misc/multiline_string"},
"javascript": {"$ref": "#/definitions/misc/multiline_string"},
"json": {"$ref": "#/definitions/misc/multiline_string"},
"pdf": {"$ref": "#/definitions/misc/multiline_string"},
"metadata": {"$ref": "#/definitions/misc/output_metadata"}
},
"patternProperties": {
"^[a-zA-Z0-9]+/[a-zA-Z0-9\\-\\+\\.]+$": {
"description": "mimetype output (e.g. text/plain), represented as either an array of strings or a string.",
"$ref": "#/definitions/misc/multiline_string"
}
}
},
"display_data": {
"description": "Data displayed as a result of code cell execution.",
"type": "object",
"additionalProperties": false,
"required": ["output_type"],
"properties": {
"output_type": {
"description": "Type of cell output.",
"enum": ["display_data"]
},
"text": {"$ref": "#/definitions/misc/multiline_string"},
"latex": {"$ref": "#/definitions/misc/multiline_string"},
"png": {"$ref": "#/definitions/misc/multiline_string"},
"jpeg": {"$ref": "#/definitions/misc/multiline_string"},
"svg": {"$ref": "#/definitions/misc/multiline_string"},
"html": {"$ref": "#/definitions/misc/multiline_string"},
"javascript": {"$ref": "#/definitions/misc/multiline_string"},
"json": {"$ref": "#/definitions/misc/multiline_string"},
"pdf": {"$ref": "#/definitions/misc/multiline_string"},
"metadata": {"$ref": "#/definitions/misc/output_metadata"}
},
"patternProperties": {
"[a-zA-Z0-9]+/[a-zA-Z0-9\\-\\+\\.]+$": {
"description": "mimetype output (e.g. text/plain), represented as either an array of strings or a string.",
"$ref": "#/definitions/misc/multiline_string"
}
}
},
"stream": {
"description": "Stream output from a code cell.",
"type": "object",
"additionalProperties": false,
"required": ["output_type", "stream", "text"],
"properties": {
"output_type": {
"description": "Type of cell output.",
"enum": ["stream"]
},
"stream": {
"description": "The stream type/destination.",
"type": "string"
},
"text": {
"description": "The stream's text output, represented as an array of strings.",
"$ref": "#/definitions/misc/multiline_string"
}
}
},
"pyerr": {
"description": "Output of an error that occurred during code cell execution.",
"type": "object",
"additionalProperties": false,
"required": ["output_type", "ename", "evalue", "traceback"],
"properties": {
"output_type": {
"description": "Type of cell output.",
"enum": ["pyerr"]
},
"ename": {
"description": "The name of the error.",
"type": "string"
},
"evalue": {
"description": "The value, or message, of the error.",
"type": "string"
},
"traceback": {
"description": "The error's traceback, represented as an array of strings.",
"type": "array",
"items": {"type": "string"}
}
}
},
"misc": {
"metadata_name": {
"description": "The cell's name. If present, must be a non-empty string.",
"type": "string",
"pattern": "^.+$"
},
"metadata_tags": {
"description": "The cell's tags. Tags must be unique, and must not contain commas.",
"type": "array",
"uniqueItems": true,
"items": {
"type": "string",
"pattern": "^[^,]+$"
}
},
"source": {
"description": "Contents of the cell, represented as an array of lines.",
"$ref": "#/definitions/misc/multiline_string"
},
"prompt_number": {
"description": "The code cell's prompt number. Will be null if the cell has not been run.",
"type": ["integer", "null"],
"minimum": 0
},
"mimetype": {
"patternProperties": {
"^[a-zA-Z0-9\\-\\+]+/[a-zA-Z0-9\\-\\+]+": {
"description": "The cell's mimetype output (e.g. text/plain), represented as either an array of strings or a string.",
"$ref": "#/definitions/misc/multiline_string"
}
}
},
"output_metadata": {
"description": "Cell output metadata.",
"type": "object",
"additionalProperties": true
},
"multiline_string": {
"oneOf" : [
{"type": "string"},
{
"type": "array",
"items": {"type": "string"}
}
]
}
}
}
}