vocabulary: "1.0.0" info: provider: Accessibility Standards description: >- Vocabulary taxonomy for web and ICT accessibility standards including WCAG, WAI-ARIA, ATAG, UAAG, Section 508, and ACT Rules Format. Covers the operational specification landscape and the cross-cutting terminology used across accessibility conformance testing. created: "2026-04-19" modified: "2026-04-19" operational: apis: - name: WCAG 2.2 namespace: wcag version: "2.2" baseUrl: https://www.w3.org/TR/WCAG22/ status: active - name: WAI-ARIA 1.2 namespace: aria version: "1.2" baseUrl: https://www.w3.org/TR/wai-aria-1.2/ status: active - name: ATAG 2.0 namespace: atag version: "2.0" baseUrl: https://www.w3.org/TR/ATAG/ status: active - name: UAAG 2.0 namespace: uaag version: "2.0" baseUrl: https://www.w3.org/TR/UAAG20/ status: active - name: Section 508 namespace: section508 version: "2017" baseUrl: https://www.access-board.gov/ict/ status: active - name: ACT Rules Format 1.1 namespace: act version: "1.1" baseUrl: https://www.w3.org/TR/act-rules-format/ status: active resources: - name: Success Criterion description: A testable statement about accessible content from WCAG api: wcag actions: [evaluate, list, reference] - name: Guideline description: A grouping of success criteria under a WCAG principle api: wcag actions: [list, reference] - name: Conformance Report description: Documentation of an accessibility evaluation against WCAG criteria api: wcag actions: [create, read, update, list] - name: ARIA Role description: A WAI-ARIA semantic role applicable to HTML elements api: aria actions: [list, reference, validate] - name: ARIA Property description: An aria-* attribute that provides additional semantics api: aria actions: [list, reference] - name: ACT Rule description: A standardized accessibility conformance testing rule api: act actions: [list, reference, apply] - name: Violation description: An identified accessibility failure in an evaluation subject api: wcag actions: [report, remediate, list] actions: - verb: evaluate description: Assess content against accessibility criteria pattern: read - verb: validate description: Check conformance of markup or structure pattern: read - verb: list description: Enumerate criteria, rules, roles, or violations pattern: read - verb: report description: Document findings from an accessibility evaluation pattern: write - verb: remediate description: Fix identified accessibility violations pattern: write - verb: reference description: Look up a specific standard or criterion by identifier pattern: read schemas: core: - WcagSuccessCriterion - WcagConformanceReport - AriaRole testing: - Violation - ActRule parameters: identifiers: - name: criterionId description: WCAG success criterion identifier (e.g. 1.1.1) - name: ruleId description: ACT rule identifier - name: roleName description: WAI-ARIA role name filters: - name: level description: Conformance level filter (A, AA, AAA) - name: principle description: POUR principle filter - name: standard description: Which standard to reference enums: levels: - A - AA - AAA principles: - Perceivable - Operable - Understandable - Robust violationSeverities: - critical - serious - moderate - minor conformanceStatus: - Passes - Fails - Partial - Not Evaluated ariaCategories: - Abstract - Widget - Document Structure - Landmark - Live Region - Window authentication: schemes: [] notes: Accessibility standards are public specifications — no authentication required capability: workflows: - name: Accessibility Conformance Audit description: Systematic evaluation of a website or application against WCAG 2.2 Level AA standards: [WCAG 2.2, Section 508] personas: [Accessibility Auditor, Developer, Legal Compliance Officer] - name: ARIA Implementation Review description: Reviewing dynamic UI components for proper WAI-ARIA role and property usage standards: [WAI-ARIA 1.2, WCAG 2.2] personas: [Front-End Developer, QA Engineer] - name: Automated CI Accessibility Testing description: Running ACT-compatible rules in CI/CD pipelines using tools like axe-core or Pa11y standards: [ACT Rules Format 1.1, WCAG 2.2] personas: [DevOps Engineer, Developer] - name: VPAT / ACR Generation description: Producing Voluntary Product Accessibility Templates documenting Section 508 and WCAG conformance standards: [Section 508, WCAG 2.2] personas: [Legal Compliance Officer, Procurement Officer] personas: - id: accessibility-auditor name: Accessibility Auditor description: Specialist who evaluates digital products against WCAG and regulatory standards workflows: [Accessibility Conformance Audit] - id: developer name: Developer description: Engineer implementing accessible UI components using ARIA and WCAG guidance workflows: [ARIA Implementation Review, Automated CI Accessibility Testing] - id: qa-engineer name: QA Engineer description: Tester validating accessibility conformance in development pipelines workflows: [ARIA Implementation Review, Automated CI Accessibility Testing] - id: compliance-officer name: Legal Compliance Officer description: Oversees regulatory compliance with Section 508, ADA, and EU Accessibility Act workflows: [Accessibility Conformance Audit, VPAT / ACR Generation] - id: procurement-officer name: Procurement Officer description: Reviews vendor VPATs during ICT procurement for federal agencies workflows: [VPAT / ACR Generation] domains: - name: Web Accessibility description: Standards for accessible web content and applications standards: [WCAG 2.2, WAI-ARIA 1.2] - name: ICT Accessibility description: Broader technology accessibility including hardware and software standards: [Section 508, UAAG 2.0] - name: Authoring Accessibility description: Making content creation tools accessible standards: [ATAG 2.0] - name: Conformance Testing description: Frameworks for consistent, automated accessibility testing standards: [ACT Rules Format 1.1] crossReference: - resource: Success Criterion operations: [evaluate, reference, list] standards: [WCAG 2.2, Section 508] personas: [Accessibility Auditor, Developer, Legal Compliance Officer] - resource: ARIA Role operations: [validate, reference, list] standards: [WAI-ARIA 1.2, WCAG 2.2] personas: [Developer, QA Engineer] - resource: ACT Rule operations: [apply, list, reference] standards: [ACT Rules Format 1.1] personas: [Developer, QA Engineer, DevOps Engineer] - resource: Conformance Report operations: [create, read, list] standards: [WCAG 2.2, Section 508] personas: [Accessibility Auditor, Legal Compliance Officer, Procurement Officer]