Web Data Management
For XML document to be valid ?

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

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

Each element must nest inside any enclosing element property
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

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