[CSS] CSS Snapshot 2018. Tab Atkins Jr., Elika J. Etemad, and Florial Rivoal editors. W3C Note 22 January 2019.

[RFC 3986] RFC 3986: Uniform Resource Identifier (URI): General Syntax. T. Berners-Lee, R. Fielding, and L. Masinter, editors. Internet Engineering Task Force. January, 2005.

[RFC 1319] RFC 1319: The MD2 Message-Digest Algorithm.. B. Kaliski, editor. Internet Engineering Task Force. April, 1992.

[RFC 1321] RFC 1321: The MD5 Message-Digest Algorith. R. Rivest, editor. Internet Engineering Task Force. April, 1992.

[RFC 2104] RFC 2104: HMAC: Keyed-Hashing for Message Authentication. H. Krawczyk, M. Bellare, and R. Canetti, editors. Internet Engineering Task Force. February, 1997.

[FIPS 180-4] FIPS 180-4: Secure Hash Standard (SHS). NIST Computer Security Resource Center. August, 2015.

[XProc 3.1] XProc 3.1: An XML Pipeline Language. Norman Walsh, Achim Berndzen, Gerrit Imsieke and Erik Siegel, editors.

[RELAX NG DTD Compatibility] RELAX NG DTD Compatibility. OASIS Committee Specification. 3 December 2001.

[UUID] ITU X.667: Information technology - Open Systems Interconnection - Procedures for the operation of OSI Registration Authorities: Generation and registration of Universally Unique Identifiers (UUIDs) and their use as ASN.1 Object Identifier components. 2004.

[W3C XML Schema: Part 1] XML Schema Part 1: Structures Second Edition. Henry S. Thompson, David Beech, Murray Maloney, et. al., editors. World Wide Web Consortium, 28 October 2004.

[W3C XML Schema: Part 2] XML Schema Part 2: Datatypes Second Edition. Paul V. Biron and Ashok Malhotra, editors. World Wide Web Consortium, 28 October 2004.

[RELAX NG] ISO/IEC JTC 1/SC 34. ISO/IEC 19757-2:2008(E) Document Schema Definition Language (DSDL) -- Part 2: Regular-grammar-based validation -- RELAX NG 2008.

[NVDL] ISO/IEC JTC 1/SC 34. ISO/IEC 19757-4:2006(E) Document Schema Definition Languages (DSDL) — Part 4: Namespace-based Validation Dispatching Language (NVDL) 2006.

[Schematron] ISO/IEC JTC 1/SC 34. ISO/IEC 19757-3:2016(E) Document Schema Definition Languages (DSDL) — Part 3: Rule-based validation — Schematron 2016.

[XSL 1.1] Extensible Stylesheet Language (XSL) Version 1.1. Anders Berglund, editor. W3C Recommendation. 5 December 2006.

[JSON schema] JSON Schema Validation: A Vocabulary for Structural Validation of JSON. A.Wright, H. Andrews and B. Hutton, editors. Internet Engineering Task Force. June, 2022.

[XInclude] XML Inclusions (XInclude) Version 1.0 (Second Edition). Jonathan Marsh, David Orchard, and Daniel Veillard, editors. W3C Recommendation. 15 November 2006.

[XML Base] XML Base (Second Edition). Jonathan Marsh and Richard Tobin, editors. W3C Recommendation. 28 January 2009.

[Invisible XML] Invisible XML Specification, version 1.0. Steven Pemberton, editor. Version 2022-06-20.