Web Data Management
Attribute standalone="no" should be included in XML declaration if a document:

has external general references
is linked to an external XSL stylesheet
has processing instructions
has an external DTD

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

the document contains atleast one or more root element
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

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