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

required when validating XML documents
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
no longer necessary after the XML editor has been customized

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Web Data Management
In XML

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

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