Describing XML document structures
Just structures, not types
RELAX NG patterns focus on the structure and contents of XML documents, not an abstract type
system. This makes it much easier to build schemas which focus squarely on the XML documents, without
worrying about the consequences for type systems.
Patterns mix choices, order, options
RELAX NG's pattern approach makes it possible to say things like "I want to have either an
author child element or an
author attribute, but not both."
RELAX NG brings back the
& operator that was lost in the transition from SGML to XML. Because of RELAX NG's mathematical
foundations, it's possible to efficiently evaluate statements like "I want a
price, a description, and a
name, but I don't care in what order they appear." Interleave even supports the mixing of ordered
RELAX NG supports namespaces pretty much transparently.
Unlike W3C XML Schema, adding attributes to elements is trivial, requiring no fundamental
change in the nature of the declaration.
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