Web Data Management
Valid XML document means (most appropriate) ?

the document has root element
Each element must nest inside any enclosing element property
the XML document has DTD associated with it & it complies with that DTD
the document contains atleast one or more root element

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Web Data Management
In XML

the external DTD subset is read before the internal DTD
there is no external type of DTD
there is no internal type of DTD
the internal DTD subset is read before the external DTD

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