{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/xml/refs/heads/main/json-schema/xml-document-schema.json",
  "title": "XML Document",
  "description": "JSON Schema describing the metadata and high-level structure of an XML document, including version, encoding, namespaces, doctype declaration, processing instructions, and the root element.",
  "type": "object",
  "properties": {
    "version": {
      "type": "string",
      "description": "XML version declared in the XML declaration.",
      "enum": ["1.0", "1.1"],
      "default": "1.0",
      "examples": ["1.0"]
    },
    "encoding": {
      "type": "string",
      "description": "Character encoding declared in the XML declaration.",
      "default": "UTF-8",
      "examples": ["UTF-8", "UTF-16", "ISO-8859-1"]
    },
    "standalone": {
      "type": "boolean",
      "description": "Whether the document is standalone (no external markup declarations affect the content)."
    },
    "doctype": {
      "type": "object",
      "description": "Document Type Declaration (DOCTYPE) information.",
      "properties": {
        "name": {
          "type": "string",
          "description": "Root element name declared in the DOCTYPE."
        },
        "publicId": {
          "type": "string",
          "description": "Public identifier of the external DTD subset."
        },
        "systemId": {
          "type": "string",
          "format": "uri-reference",
          "description": "System identifier (URI) of the external DTD subset."
        }
      }
    },
    "processingInstructions": {
      "type": "array",
      "description": "Processing instructions declared at the document root.",
      "items": {
        "type": "object",
        "properties": {
          "target": {
            "type": "string",
            "description": "Processing instruction target (e.g. xml-stylesheet)."
          },
          "data": {
            "type": "string",
            "description": "Processing instruction data."
          }
        },
        "required": ["target"]
      }
    },
    "namespaces": {
      "type": "array",
      "description": "Namespace declarations in scope on the root element.",
      "items": {
        "type": "object",
        "properties": {
          "prefix": {
            "type": "string",
            "description": "Namespace prefix (empty string for default namespace).",
            "examples": ["", "xs", "xsl", "soap"]
          },
          "uri": {
            "type": "string",
            "format": "uri",
            "description": "Namespace URI.",
            "examples": ["http://www.w3.org/2001/XMLSchema"]
          }
        },
        "required": ["uri"]
      }
    },
    "rootElement": {
      "type": "string",
      "description": "Local name of the root element.",
      "examples": ["catalog", "soap:Envelope", "feed"]
    },
    "schemaLocation": {
      "type": "string",
      "description": "Optional xsi:schemaLocation value pairing namespaces to schema URIs."
    },
    "noNamespaceSchemaLocation": {
      "type": "string",
      "format": "uri-reference",
      "description": "Optional xsi:noNamespaceSchemaLocation value for documents without a target namespace."
    },
    "validation": {
      "type": "object",
      "description": "Validation status and metadata for the document.",
      "properties": {
        "wellFormed": {
          "type": "boolean",
          "description": "Whether the document is well-formed per the XML specification."
        },
        "valid": {
          "type": "boolean",
          "description": "Whether the document is valid against the declared DTD or schema."
        },
        "schemaType": {
          "type": "string",
          "description": "Type of schema used for validation.",
          "enum": ["DTD", "XSD", "RelaxNG", "Schematron", "None"]
        }
      }
    },
    "uri": {
      "type": "string",
      "format": "uri-reference",
      "description": "URI of the XML document."
    },
    "created": {
      "type": "string",
      "format": "date",
      "description": "Date the document was created."
    },
    "modified": {
      "type": "string",
      "format": "date",
      "description": "Date the document was last modified."
    }
  },
  "required": ["version", "rootElement"]
}