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

Each element must nest inside any enclosing element property
the XML document has DTD associated with it & it complies with that DTD
the document has root element
the document contains atleast one or more root element

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

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