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

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

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

XML uses a description node to describe data
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

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