Web Data Management
For XML document to be valid ?

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

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Web Data Management
In XML

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

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