{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "title": "Meta Definition Schema for register_meta_from_file() helper",
  "description": "A schema for registering post/term meta definitions with register_meta_from_file().",
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "$schema": {
      "type": "string"
    }
  },
  "patternProperties": {
    "^[a-zA-Z0-9_\\-]+$": {
      "type": "object",
      "additionalProperties": true,
      "not": {
        "allOf": [
          { "required": ["post_types"] },
          { "required": ["terms"] }
        ]
      },
      "properties": {
        "default": {
          "description": "The default value for this meta key.",
          "type": "string"
        },
        "description": {
          "description": "A description of the data attached to this meta key.",
          "type": "string"
        },
        "label": {
          "description": "A human-readable label of the data attached to this meta key.",
          "type": "string"
        },
        "post_types": {
          "description": "The post types that can use this meta key.",
          "type": "array",
          "items": {
            "type": "string"
          }
        },
        "show_in_rest": {
          "description": "Whether to show this meta key in the REST API.",
          "type": "boolean",
          "default": true
        },
        "single": {
          "description": "Whether this meta key is a single value or an array of values.",
          "type": "boolean",
          "default": true
        },
        "terms": {
          "description": "An array of taxonomy slugs this meta key is associated with.",
          "type": "array",
          "items": {
            "type": "string"
          }
        },
        "type": {
          "description": "The type of data associated with this meta key.",
          "type": "string",
          "enum": [
            "string",
            "boolean",
            "integer",
            "number",
            "array",
            "object"
          ]
        }
      }
    }
  }
}