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> 1) They're not scoped, everything else about the language is. Well a pi that declares an attribute to be of type ID may be compared to an attribute declaration doing the same, and attribute declarations aren't really scoped (other than to the whole document) either. > 2) They're not declared in the grammar (DTD/Schema), so their usage is not > subject to any declarative/universal quality control: That is surely a feature of the schema language rather than of PIs. DTD's intentionally don't control pi's (or to put it another way pi's are intentionally there to do things that are not constrained by the grammar of the dtd) but a different schema language could easily choose to have constraints on these. You (or at least the schema WG) choose not to do so in W3C XML Schema, but you could have done so. Schematron schemas for example can constrain the position and content of PIs (and comments and anything else in the XPath data model). David _____________________________________________________________________ This message has been checked for all known viruses by Star Internet delivered through the MessageLabs Virus Scanning Service. For further information visit http://www.star.net.uk/stats.asp or alternatively call Star Internet for details on the Virus Scanning Service.
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