XMLHttpRequest: Why list HTTP method names

I find a bit odd for the XMLHttpRequest draft to require all implementations
to support the listed method names. In particular, what the motivation for
the conformance statement -

"User agents *must* at least support the following list of methods (see [
RFC2616 <http://www.w3.org/TR/XMLHttpRequest/#RFC2616>],
[RFC2518<http://www.w3.org/TR/XMLHttpRequest/#ref-rfc2518>],
[RFC3253 <http://www.w3.org/TR/XMLHttpRequest/#ref-rfc3253>],
[RFC3648<http://www.w3.org/TR/XMLHttpRequest/#ref-rfc3648>]
and [RFC3744 <http://www.w3.org/TR/XMLHttpRequest/#ref-rfc3744>])"
The method list should be an implementation choce. Moreover, the current
language does not allow special purpose implementations, say, to want to
support only GET and POST.

Subbu



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