{
  "$schema": "https://json-structure.org/meta/core/v0/#",
  "$id": "https://raw.githubusercontent.com/api-evangelist/wcag/refs/heads/main/json-structure/wcag-success-criterion-structure.json",
  "name": "SuccessCriterion",
  "description": "A WCAG success criterion defining a testable requirement for web content accessibility.",
  "type": "object",
  "required": [
    "id",
    "title",
    "level",
    "principle",
    "guideline"
  ],
  "properties": {
    "id": {
      "type": "string",
      "description": "Unique identifier for the success criterion (e.g., 1.1.1, 2.4.7).",
      "pattern": "^[1-4]\\.[1-9]\\.[0-9]+$",
      "example": "1.1.1"
    },
    "title": {
      "type": "string",
      "description": "Short title of the success criterion.",
      "example": "Non-text Content"
    },
    "description": {
      "type": "string",
      "description": "Full normative text of the success criterion.",
      "example": "All non-text content that is presented to the user has a text alternative that serves the equivalent purpose."
    },
    "level": {
      "type": "string",
      "enum": [
        "A",
        "AA",
        "AAA"
      ],
      "description": "Conformance level: A (minimum), AA (standard), AAA (enhanced).",
      "example": "A"
    },
    "principle": {
      "type": "string",
      "enum": [
        "Perceivable",
        "Operable",
        "Understandable",
        "Robust"
      ],
      "description": "The POUR principle this criterion belongs to.",
      "example": "Perceivable"
    },
    "guideline": {
      "type": "string",
      "description": "Parent guideline identifier and title.",
      "example": "1.1 Text Alternatives"
    },
    "wcag_version": {
      "type": "string",
      "description": "WCAG version that introduced or updated this criterion.",
      "enum": [
        "2.0",
        "2.1",
        "2.2"
      ],
      "example": "2.0"
    },
    "url": {
      "type": "uri",
      "description": "URL to the official specification text for this criterion.",
      "example": "https://www.w3.org/TR/WCAG22/#non-text-content"
    },
    "understanding_url": {
      "type": "uri",
      "description": "URL to the Understanding WCAG document for this criterion.",
      "example": "https://www.w3.org/WAI/WCAG22/Understanding/non-text-content.html"
    },
    "sufficient_techniques": {
      "type": "array",
      "description": "List of sufficient technique identifiers for meeting this criterion.",
      "items": {
        "type": "string"
      },
      "example": [
        "G94",
        "H37",
        "H36"
      ]
    },
    "failures": {
      "type": "array",
      "description": "List of failure technique identifiers that fail this criterion.",
      "items": {
        "type": "string"
      },
      "example": [
        "F3",
        "F13"
      ]
    }
  }
}