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Apart from the built-in DTD support in parsers, lxml currently supports three schema languages: DTD, Relax NG and XML Schema.

All three provide identical APIs in lxml, represented by validator classes with the obvious names.

Tools · Usage · Resources · Specifications and Development XML Schemas express shared vocabularies and allow machines to carry out rules made by people.

They provide a means for defining the structure, content and semantics of XML documents. XML Schema 1.0 was approved as a W3C Recommendation on and a second edition incorporating many errata was published on 28 October 2004; see reference list for pointers.

You may also view this list in XML, DAML and OWL formats or using Spectacle.

XML Schema 1.1 Part 2: Datatypes and XML Schema 1.1 Part 1: Structures are available.

Two major functions it supports are merging multiple ontologies together and diagnosing individual or multiple ontologies. EDU/software/chimaera/ Ontology Analyzer Java toolkit for RDF and DAML OIL, from HP Labs Bristol.

It supports users in such tasks as loading knowledge bases in differing formats, reorganizing taxonomies, resolving name conflicts, browsing ontologies, editing terms, etc. It supports both resource- and statement-centric processing, and daml:collection.

XML schema is supported in a similar way, but requires an explicit schema to be provided: As described above, the parser support for DTDs depends on internal or external subsets of the XML file.

This means that the XML file itself must either contain a DTD or must reference a DTD to make this work.

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The XML Schema Working Group, part of the XML Activity, is responsible for the W3C's work on this topic -- for details see the Working Group's charter.