XML Schema Language Comparison
An XML schema is a description of a type of XML document, typically expressed in terms of constraints on the structure and content of documents of that type, above and beyond the basic syntax constraints imposed by XML itself. There are several different languages available for specifying an XML schema. Each language has its strengths and weaknesses.
Note: the W3C defined schema language is called "XML Schema". However, this name can be confusing in the context of referring to a number of XML schema languages. As such, throughout this document, references to the term "XML schema" will be any XML schema language where the meaning might be ambiguous, while the term "W3C XML Schema" (referred to in this article as WXS) will be used for the W3C-defined XML schema language.
Read more about XML Schema Language Comparison: Overview, Schematron, Namespace Routing Language (NRL)
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