{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "title": "Data format specification schema Version 1.0.1",
    "type": "object",
    "oneOf": [{
        "properties": {
            "self": {
                "$ref": "#/definitions/self"
            },
            "dataformatversion": {
                "$ref": "#/definitions/dataformatversion"
            },
            "reference": {

                "type": "object",
                "description": "A reference to an external schema - name/version or url, if specified, is used to access the artifact",
                "properties": {
                    "name": {
                        "$ref": "#/definitions/name"
                    },
                    "url": {
                        "$ref": "#/definitions/url"
                    },
                    "version": {
                        "$ref": "#/definitions/version"
                    },
                    "format": {
                        "$ref": "#/definitions/format"
                    }
                },
                "required": [
                    "name",
                    "version",
                    "format"
                ],
                "additionalProperties": false
            }
        },
        "required": ["self", "dataformatversion", "reference"],
        "additionalProperties": false
    }, {
        "properties": {
            "self": {
                "$ref": "#/definitions/self"
            },
            "dataformatversion": {
                "$ref": "#/definitions/dataformatversion"
            },
            "jsonschema": {
                "$schema": "http://json-schema.org/draft-04/schema#",
                "description": "The actual JSON schema for this data format"
            }

        },
        "required": ["self", "dataformatversion", "jsonschema"],
        "additionalProperties": false
    }, {
        "properties": {
            "self": {
                "$ref": "#/definitions/self"
            },
            "dataformatversion": {
                "$ref": "#/definitions/dataformatversion"
            },
            "delimitedschema": {
                "type": "object",
                "description": "A JSON schema for delimited files",
                "properties": {
                    "delimiter": {
                        "enum": [",", "|", "\t"]
                    },
                    "fields": {
                        "type": "array",
                        "description": "Array of field descriptions",
                        "items": {
                            "$ref": "#/definitions/field"
                        }
                    }
                },
                "additionalProperties": false
            }
        },
        "required": ["self", "dataformatversion", "delimitedschema"],
        "additionalProperties": false
    }, {
        "properties": {
            "self": {
                "$ref": "#/definitions/self"
            },
            "dataformatversion": {
                "$ref": "#/definitions/dataformatversion"
            },
            "unstructured": {
                "type": "object",
                "description": "A JSON schema for unstructured text",
                "properties": {
                    "encoding": {
                        "type": "string",
                        "enum": ["ASCII", "UTF-8", "UTF-16", "UTF-32"]
                    }
                },
                "additionalProperties": false

            }
        },
        "required": ["self", "dataformatversion", "unstructured"],
        "additionalProperties": false
    }],
    "definitions": {
         "url": {
             "format": "uri"
        },
        "name": {
            "type": "string"
        },
        "version": {
            "type": "string",
            "pattern": "^(\\d+\\.)(\\d+\\.)(\\*|\\d+)$"
        },
        "self": {
            "description": "Identifying Information for the Data Format - name/version can be used to access the artifact",
            "type": "object",
            "properties": {
                "name": {
                    "$ref": "#/definitions/name"
                },
                "version": {
                    "$ref": "#/definitions/version"
                },
                "description": {
                    "type": "string"
                }
            },
            "required": [
                "name",
                "version"
            ],
            "additionalProperties": false
        },
        "format": {
            "description": "Reference schema type",
            "type": "string",
            "enum": [
                "JSON",
                "Delimited Format",
                "XML",
                "Protocol Buffer",
                "Unstructured"
            ]
        },
        "field": {
            "description": "A field definition for the delimited schema",
            "type": "object",
            "properties": {
                "name": {
                    "type": "string"
                },
                "description": {
                    "type": "string"
                },
                "fieldtype": {
                    "description": "the field type - from the XML schema types",
                    "type": "string",
                    "enum": ["string", "boolean",
                        "decimal", "float", "double",
                        "duration", "dateTime", "time",
                        "date", "gYearMonth", "gYear",
                        "gMonthDay", "gDay", "gMonth",
                        "hexBinary", "base64Binary",
                        "anyURI", "QName", "NOTATION",
                        "normalizedString", "token",
                        "language", "IDREFS", "ENTITIES",
                        "NMTOKEN", "NMTOKENS", "Name",
                        "NCName", "ID", "IDREF", "ENTITY",
                        "integer", "nonPositiveInteger",
                        "negativeInteger", "long", "int",
                        "short", "byte",
                        "nonNegativeInteger", "unsignedLong",
                        "unsignedInt", "unsignedShort",
                        "unsignedByte", "positiveInteger"

                    ]
                },
                "fieldPattern": {
                    "description": "Regular expression that defines the field format",
                    "type": "integer"
                },
                "fieldMaxLength": {
                    "description": "The maximum length of the field",
                    "type": "integer"
                },
                "fieldMinLength": {
                    "description": "The minimum length of the field",
                    "type": "integer"
                },
                "fieldMinimum": {
                    "description": "The minimum numeric value of the field",
                    "type": "integer"
                },
                "fieldMaximum": {
                    "description": "The maximum numeric value of the field",
                    "type": "integer"
                }
            },
            "additionalProperties": false
        },
        "dataformatversion": {
            "type": "string",
            "enum": ["1.0.0", "1.0.1"]
        }
    }
}