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XML is rapidly becoming a very important type of data resource, especially in the Internet environment. On the one hand, HTML
is evolving to be XML-compliant; in the near future, all HTML documents can be expected to become valid XML documents. On
the other hand, XML is quickly becoming the standard format for interchange of data and/or metadata (for example, XMI). Therefore,
XML documents (or streams) representing data and/or metadata can be expected to appear everywhere.
The XML package contains classes and associations that represent common metadata describing XML data resources. It is based
on XML 1.0 [XML]. XML Schema is an ongoing activity in the W3C. As future standards are adopted by the W3C on XML Schema,
this package will be revised and extended accordingly.