question: where is the colon in processing instruction names

[Arthur Rother]

Hello, 

In one of the XML-DEV posted messages it says, that colons
are not allowed in processing instruction names.
The XML parser in IE5 does not allow colons in processing
names. But I could not find anything in 
http://www.w3.org/TR/REC-xml#sec-pi
The question is, is it allowed, and if not, why?
This is probably discussed allready, but I could not find
more as the one message mentioned.

Thanks,

Arthur Rother

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