Web Data Management
In XML

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

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Web Data Management
There is a way of describing XML data, how?

XML uses a DTD to describe the data
XML uses XSL to describe data
XML uses a DTD to describe the data & XML uses a description node to describe data
XML uses a description node to describe data

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