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
no longer necessary after the XML editor has been customized
required when validating XML documents
used to direct conversion using an XSLT processor

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Web Data Management
In XML

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

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