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> It was the wording of internal subset vs internal entity that got me I > think. Section 4.5 does not distinguish between internal entities in > the internal subset and those external to the xml file. Right. You must be careful to distinguish between these distinctions: - internal and external entities - internally and externally defined entities - parameter entity references in the internal and external subsets > Do you know why there is the restriction on PEs in internal subsets. > It does make non-validating parser's easier I guess since they aren't > required to read external entities. They're not required to expand *any* parameter entities. Constraining them to be at the top-level, and expand to whole declarations, allows them to be skipped over. -- Richard
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