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   Comments on Section 2.2 of XML-Namespaces

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  • From: james anderson <James.Anderson@mecom.mixx.de>
  • To: "xml-dev@ic.ac.uk" <xml-dev@ic.ac.uk>, tbray@textuality.com, andrewl@microsoft.com, dmh@corp.hp.com
  • Date: Wed, 01 Apr 1998 19:56:44 +0200

hello again,

is the constraint on uniqueness in 2.2 intended to apply within a namespacepi or
across the scope of the pi? one one hand, the former makes little sense, but, on
the other hand, the latter is too strict.

where you specify (2.2...)

"Namespace Constraint: Unique Prefix
A namespace prefix may not be declared more than once; i.e. there may not be two
PrefixDefs which contain the same NCName string."

you make it impossible to declare a namespace in an external subset which would be
intended to be used from documents which do not always require that the external
subset be read. in such cases (perhaps likely - for documentary reasons - in all
cases), one would wish to place the ns-pi both in the external subset and in the
instance document.
the constraint needs to be relaxed to permit multiple occurrences of a NCName where
the namespace names (and if present the schema name) agree.

bye for now,

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