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

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

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Web Data Management
For XML document to be valid ?

document need to be well formed also
document need to be well formed & valid
document validity has no relationship with well formedness
document need not to be well formed

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