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

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

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Web Data Management
In XML

there is no internal type of DTD
there is no external 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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