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   Duplicate namespace prefixes

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I have just started to work with XML and I am beginning to look at
validation with DTDs and XML Schemas. I think I have grasped the need for
and usage of namespaces within XML however, I am stumbling over the use of

For example, company A decides to create their own vocabulary using the URI
www.companyA.co.uk/transaction/2003/version1 and rather than using this as
the default namespace they prefix all their elements with trans.  A few
months down the line and a vast number of documents later they come across a
vocabulary they wish to include within their own. However, this vocabulary
also uses the namespace prefix trans. Even though the URIs are distinct the
prefixes are the same.

Does this cause problems when validating the XML i.e. the prefixes are
identical and a prefix can only be associated with one URI at a time? Do
they now need to change their prefix from trans to transcompanyA in all
their XML? or more likely I am missing something when it comes to validating
XML which uses namespaces?

Apologies if this question has an obvious answer, but it has been rattling
around in my mind for some time. 


> Harvey Morcom
> Knowledge Analyst
> harvey.morcom@kpmg.co.uk
> Tel: 788 6090 (020 7694 6090)

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