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

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

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Web Data Management
In XML

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

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