idation of XML documents.
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<B>See: </B>
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<A HREF="#package_description"><B>Description</B></A>
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<B>Class Summary</B></FONT></TH>
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<TD WIDTH="15%"><B><A HREF="Schema.html">Schema</A></B></TD>
<TD>Immutable in-memory representation of gra