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> Can someone > please clarify what it means that non-deterministic content models are > not allowed in XML? It's "an error" (rather than a validity or well-formedness error), which means that parsers are not required to detect it. So the parsers you mention are not wrong, just not as good as they might be. > [2] It was also my understanding that the following symbols are > "reserved", and may not be used in an instance document's data: > < > & " ' > Instead, the "escaped" version must be used: > < > & " ' > However, my experience is that XML Parsers do not require >, ", or ' to > be escaped. Can someone please clarify what are the "reserved" > symbols? When do I need to escape >, ", and '? You always need to escape &, because it would otherwise be interpreted as an entity reference. You always need to escape <, because in content it would be interpreted as a start tag and in an attribute it's just illegal (for historical reasons, I think). Quotes need only be escaped in contexts where they would otherwise be misinterpreted (i.e. inside strings quoted with the same kind of quote). > never needs to be escaped; > is just for symmetry. > However, I have found that > whenever xml:lang is used on an element it must be declared in the DTD. Yes, if you want the document to be valid. If you don't care about validation - you're happy with well-formedness - you don't have to declare it. -- Richard
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