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 Several schema dialects have been developed in the XML language. Each dialect has distinct advantages and disadvantages. A listing of these dialects and their descriptions are listed below along with a URL for more information.
Links to several schema definitions: http://www.oasis-open.org/cover/schemas.html
DDML stands for Document Definition Markup Language. It is a schema language for XMl documents, encoding the logical (as opposed to physical) content of DTDs in an XML document. It is also known as XSchema.
URL: http://www.w3.org/TR/NOTE-ddml
RELAX stands for Regular Language for XML. It is based on a Japanese national schema standard.
URL: http://www.xml.gr.jp/relax/
This language combines the RELAX and NG schema specifications.
URLS: http://www.oasis-open.org/committees/relax-ng/ http://www.zvon.org/xxl/XMLSchemaTutorial/Output/index.html
The Schematron schema represents documents using a tree pattern, allowing support for those document structures that might be difficult to represent in more traditional schema languages.
URLS: http://www.zvon.org/xxl/SchematronTutorial/General/contents.html http://www.ascc.net/xml/resource/schematron/schematron.html http://www.topologi.com/public/Schtrn_XSD/Paper.html
TREX stands for Tree Regular Expressions. This schema specifies a pattern for the structure and content of an XML document, identifying a class of XML documents that match the pattern.
URL: http://www.thaiopensource.com/trex/
XDR stands for XML-Data Reduced. This schema is developed and supported by Microsoft, in particular, Microsoft's Internet Explorer browser. XDR is sometimes referred to as XML-Data.
URL: http://www.ltg.ed.ac.uk/~ht/XMLData-Reduced.htm
XML-Schema, created by the W3C Schema Working Group, is a large specification designed to handle a broad range of document structures. It is also referred to as XSD.
URL: http://www.w3.org/XML/Schema |
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