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 not to be well formed
document need to be well formed & valid

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Web Data Management
The use of a DTD in XML development is ?

a good guide to populating a templates to be filled in when generating an XML document automatically
used to direct conversion using an XSLT processor
required when validating XML documents
no longer necessary after the XML editor has been customized

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