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don't store signatures in notebooks...
don't store signatures in notebooks store them in an sqlite database instead. The algorithm and signature are stored and not associated with a path. This means that moving files around doesn't affect trust, and every trusted change to a notebook remains trusted.
Min RK - - Load All Authors

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nbformat.v4.schema.json
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{
"$schema": "http://json-schema.org/draft-04/schema#",
"description": "IPython Notebook v4.0 JSON schema.",
"type": "object",
"additionalProperties": false,
"required": ["metadata", "nbformat_minor", "nbformat", "cells"],
"properties": {
"metadata": {
"description": "Notebook root-level metadata.",
"type": "object",
"additionalProperties": true,
"properties": {
"kernelspec": {
"description": "Kernel information.",
"type": "object",
"required": ["name", "display_name"],
"properties": {
"name": {
"description": "Name of the kernel specification.",
"type": "string"
},
"display_name": {
"description": "Name to display in UI.",
"type": "string"
}
}
},
"language_info": {
"description": "Kernel information.",
"type": "object",
"required": ["name"],
"properties": {
"name": {
"description": "The programming language which this kernel runs.",
"type": "string"
},
"codemirror_mode": {
"description": "The codemirror mode to use for code in this language.",
"oneOf": [
{"type": "string"},
{"type": "object"}
]
},
"file_extension": {
"description": "The file extension for files in this language.",
"type": "string"
},
"mimetype": {
"description": "The mimetype corresponding to files in this language.",
"type": "string"
},
"pygments_lexer": {
"description": "The pygments lexer to use for code in this language.",
"type": "string"
}
}
},
"orig_nbformat": {
"description": "Original notebook format (major number) before converting the notebook between versions. This should never be written to a file.",
"type": "integer",
"minimum": 1
}
}
},
"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": 4,
"maximum": 4
},
"cells": {
"description": "Array of cells of the current notebook.",
"type": "array",
"items": {"$ref": "#/definitions/cell"}
}
},
"definitions": {
"cell": {
"type": "object",
"oneOf": [
{"$ref": "#/definitions/raw_cell"},
{"$ref": "#/definitions/markdown_cell"},
{"$ref": "#/definitions/code_cell"}
]
},
"raw_cell": {
"description": "Notebook raw nbconvert cell.",
"type": "object",
"additionalProperties": false,
"required": ["cell_type", "metadata", "source"],
"properties": {
"cell_type": {
"description": "String identifying the type of cell.",
"enum": ["raw"]
},
"metadata": {
"description": "Cell-level metadata.",
"type": "object",
"additionalProperties": true,
"properties": {
"format": {
"description": "Raw cell metadata format for nbconvert.",
"type": "string"
},
"name": {"$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", "metadata", "source"],
"properties": {
"cell_type": {
"description": "String identifying the type of cell.",
"enum": ["markdown"]
},
"metadata": {
"description": "Cell-level metadata.",
"type": "object",
"properties": {
"name": {"$ref": "#/definitions/misc/metadata_name"},
"tags": {"$ref": "#/definitions/misc/metadata_tags"}
},
"additionalProperties": true
},
"source": {"$ref": "#/definitions/misc/source"}
}
},
"code_cell": {
"description": "Notebook code cell.",
"type": "object",
"additionalProperties": false,
"required": ["cell_type", "metadata", "source", "outputs", "execution_count"],
"properties": {
"cell_type": {
"description": "String identifying the type of cell.",
"enum": ["code"]
},
"metadata": {
"description": "Cell-level metadata.",
"type": "object",
"additionalProperties": true,
"properties": {
"collapsed": {
"description": "Whether the cell is collapsed/expanded.",
"type": "boolean"
},
"autoscroll": {
"description": "Whether the cell's output is scrolled, unscrolled, or autoscrolled.",
"enum": [true, false, "auto"]
},
"name": {"$ref": "#/definitions/misc/metadata_name"},
"tags": {"$ref": "#/definitions/misc/metadata_tags"}
}
},
"source": {"$ref": "#/definitions/misc/source"},
"outputs": {
"description": "Execution, display, or stream outputs.",
"type": "array",
"items": {"$ref": "#/definitions/output"}
},
"execution_count": {
"description": "The code cell's prompt number. Will be null if the cell has not been run.",
"type": ["integer", "null"],
"minimum": 0
}
}
},
"unrecognized_cell": {
"description": "Unrecognized cell from a future minor-revision to the notebook format.",
"type": "object",
"additionalProperties": true,
"required": ["cell_type", "metadata"],
"properties": {
"cell_type": {
"description": "String identifying the type of cell.",
"not" : {
"enum": ["markdown", "code", "raw"]
}
},
"metadata": {
"description": "Cell-level metadata.",
"type": "object",
"properties": {
"name": {"$ref": "#/definitions/misc/metadata_name"},
"tags": {"$ref": "#/definitions/misc/metadata_tags"}
},
"additionalProperties": true
}
}
},
"output": {
"type": "object",
"oneOf": [
{"$ref": "#/definitions/execute_result"},
{"$ref": "#/definitions/display_data"},
{"$ref": "#/definitions/stream"},
{"$ref": "#/definitions/error"}
]
},
"execute_result": {
"description": "Result of executing a code cell.",
"type": "object",
"additionalProperties": false,
"required": ["output_type", "data", "metadata", "execution_count"],
"properties": {
"output_type": {
"description": "Type of cell output.",
"enum": ["execute_result"]
},
"execution_count": {
"description": "A result's prompt number.",
"type": ["integer", "null"],
"minimum": 0
},
"data": {"$ref": "#/definitions/misc/mimebundle"},
"metadata": {"$ref": "#/definitions/misc/output_metadata"}
}
},
"display_data": {
"description": "Data displayed as a result of code cell execution.",
"type": "object",
"additionalProperties": false,
"required": ["output_type", "data", "metadata"],
"properties": {
"output_type": {
"description": "Type of cell output.",
"enum": ["display_data"]
},
"data": {"$ref": "#/definitions/misc/mimebundle"},
"metadata": {"$ref": "#/definitions/misc/output_metadata"}
}
},
"stream": {
"description": "Stream output from a code cell.",
"type": "object",
"additionalProperties": false,
"required": ["output_type", "name", "text"],
"properties": {
"output_type": {
"description": "Type of cell output.",
"enum": ["stream"]
},
"name": {
"description": "The name of the stream (stdout, stderr).",
"type": "string"
},
"text": {
"description": "The stream's text output, represented as an array of strings.",
"$ref": "#/definitions/misc/multiline_string"
}
}
},
"error": {
"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": ["error"]
},
"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"}
}
}
},
"unrecognized_output": {
"description": "Unrecognized output from a future minor-revision to the notebook format.",
"type": "object",
"additionalProperties": true,
"required": ["output_type"],
"properties": {
"output_type": {
"description": "Type of cell output.",
"not": {
"enum": ["execute_result", "display_data", "stream", "error"]
}
}
}
},
"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.",
"$ref": "#/definitions/misc/multiline_string"
},
"execution_count": {
"description": "The code cell's prompt number. Will be null if the cell has not been run.",
"type": ["integer", "null"],
"minimum": 0
},
"mimebundle": {
"description": "A mime-type keyed dictionary of data",
"type": "object",
"additionalProperties": false,
"properties": {
"application/json": {
"type": "object"
}
},
"patternProperties": {
"^(?!application/json$)[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"
}
}
},
"output_metadata": {
"description": "Cell output metadata.",
"type": "object",
"additionalProperties": true
},
"multiline_string": {
"oneOf" : [
{"type": "string"},
{
"type": "array",
"items": {"type": "string"}
}
]
}
}
}
}