The Information Set Model Versus the XSLT Tree Model
XML parsers pass on only certain information, as dictated by the core XML Information Set specification, which you can find at www.w3.org/TR/xml-infoset (see New Rider’s Inside XML for more information on XML Information Sets), whereas XSLT processors adhere to the XSLT tree model. These models, and what they consider important, are different, which can lead to problems.
For example, two XML items that are part of the core information set but are not available in XSLT: notations and skipped entity references (entity references that the XML parser has chosen not to expand). In practice, this means that even if the XML parser passes on information about these items, the XSLT processor can’t ...
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