Web Data Management
For XML document to be valid ?

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

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Web Data Management
In XML

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

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