{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://designlasagna.recipes/schemas/v0.4/cem-extensions.json",
  "title": "CEM Extensions for Design Systems",
  "description": "Definitions-only, composable lifecycle fragments for Custom Elements Manifest entries. This document is not a validator for a full Custom Elements Manifest; consumers apply the relevant definition alongside their pinned CEM schema.",
  "definitions": {
    "LifecycleFields": {
      "type": "object",
      "description": "Lifecycle siblings that may be composed with a CEM entry. The fragment remains permissive so standard CEM fields and other extensions are preserved.",
      "properties": {
        "deprecated": {
          "oneOf": [
            { "type": "boolean" },
            { "type": "string" }
          ],
          "description": "Standard CEM deprecation marker. A string carries the human-readable deprecation message."
        },
        "status": { "$ref": "lifecycle.json#/definitions/Status" },
        "removal": {
          "type": "string",
          "description": "Removal target: ISO date YYYY-MM-DD, semver X.Y.Z, or quarter YYYY-Qn."
        },
        "replacement": {
          "type": "string",
          "description": "Machine-readable replacement identifier, scoped to the same CEM entity kind and owner."
        }
      }
    },
    "DeprecatedValue": {
      "$ref": "lifecycle.json#/definitions/DeprecatedValue"
    },
    "AttributeExtensions": {
      "type": "object",
      "description": "Composable extension fields for a CEM attribute entry. Attribute-level lifecycle and deprecated values are independent axes; this fragment remains permissive for standard CEM siblings.",
      "properties": {
        "enum": {
          "type": "array",
          "items": { "type": "string" }
        },
        "deprecated": {
          "oneOf": [
            { "type": "boolean" },
            { "type": "string" }
          ]
        },
        "status": { "$ref": "lifecycle.json#/definitions/Status" },
        "removal": { "type": "string" },
        "replacement": { "type": "string" },
        "deprecatedValues": {
          "type": "array",
          "items": { "$ref": "#/definitions/DeprecatedValue" }
        }
      }
    },
    "DeclarationExtensions": {
      "$ref": "#/definitions/LifecycleFields"
    },
    "MemberExtensions": {
      "$ref": "#/definitions/LifecycleFields"
    },
    "SlotExtensions": {
      "$ref": "#/definitions/LifecycleFields"
    },
    "CssPropertyExtensions": {
      "$ref": "#/definitions/LifecycleFields"
    },
    "CssPartExtensions": {
      "$ref": "#/definitions/LifecycleFields"
    },
    "EventExtensions": {
      "$ref": "#/definitions/LifecycleFields"
    }
  }
}