Re: [sipcore] Extensions to the reg event package

My knowledge of XML schemas is limited to cutting and pasting from 
existing ones, and attempting to follow apparent conventions I see used.
(Equivalent to implementing SIP based on wireshark output.)

It would be great if somebody who knows better were to write a best 
practices document for applying XML to SIP stuff. And perhaps there 
should be some sort of official XML review of drafts.

	Thanks,
	Paul

On 10/21/2010 1:44 PM, Worley, Dale R (Dale) wrote:
> I've noticed that extensions to the reg event package are done by introducing new namespaces.  Since extensions usually add only one or two data items to the package, the result can be an XML document with many namespaces,  most of which have a very few element types being used.  It seems to me to be more natural for extensions to add elements to the original XML schema.  And since the interpreter of the XML document will ignore any elements that it does not recognize, this practice would be upward-compatible.  I suspect that there is some formal reason why extending an existing namespace is not done.
>
> Dale
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