{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://matjson.org/schema/core/0.1/schema.json",
  "title": "MatJSON Core v0.1 — Architecture Placeholder",
  "description": "Shared semantic primitives for MatJSON profiles. This starter schema is intentionally incomplete and must not be treated as a stable production contract.",
  "x-matjson-profile": "core",
  "x-matjson-status": "tbc",
  "type": "object",
  "$defs": {
    "identifier": {
      "type": "string",
      "format": "uri",
      "description": "Stable MatJSON identifier or another authoritative URI."
    },
    "quantity": {
      "type": "object",
      "required": [
        "value",
        "unit"
      ],
      "additionalProperties": false,
      "properties": {
        "value": {
          "type": "number"
        },
        "unit": {
          "type": "string"
        },
        "basis": {
          "type": "string"
        },
        "source": {
          "$ref": "#/$defs/source"
        }
      }
    },
    "source": {
      "type": "object",
      "required": [
        "document",
        "locator"
      ],
      "properties": {
        "document": {
          "type": "string"
        },
        "edition": {
          "type": "string"
        },
        "locator": {
          "type": "string"
        },
        "page": {
          "type": [
            "integer",
            "string"
          ]
        },
        "text_role": {
          "enum": [
            "normative",
            "informative",
            "example",
            "note",
            "unknown"
          ]
        }
      }
    },
    "expression": {
      "type": "object",
      "description": "TBC Boolean or numeric expression tree for applicability, calculations, and decision procedures."
    },
    "extensionContainer": {
      "type": "object",
      "propertyNames": {
        "format": "uri"
      },
      "additionalProperties": true
    }
  }
}