XML directory and extension structure in PHP5opt

Hi

i'd like to discuss the future directory structure and extension naming
scheme in PHP5.

As some people are currently rewriting domxml and expat, I think, it's
about time to come up with some decent scheme. As a lot of the XML
Support in PHP5 will be based on libxml2, it would make sense to base
those extensions on some common stuff.

My proposal is (and I didn't really think it through, maybe there are
some holes in it)

We put all libxml2 based extension in subdirectories of  ext/xml ->

ext/xml/dom
ext/xml/sax
ext/xml/xslt
ext/xml/schema
ext/xml/xpath
etc...

in ext/xml there are some common used functions (a lot of those
extensions need access to DomDocument and associated classes and the
whole memory management). 

configure would then take the options:

--enable-xml-dom
--enable-xml-sax 
or even
--enable-xml-all

The naming scheme could then be:

xml_dom_foobar
xml_xpath_foobar

as most presumably all xml extensions will have a OO-Interface, it
doesn't really matter, if the names get a little bit long this way.

The current ext/xml function (xml_parser, xml_set_...handler, etc) could
be kept for BC reasons (ext/xml is available for a too long time to just
get rid of those functions).

Opinions? other Suggestions?

chregu