sld and posting a getmap request
the sld specification mentions using http post to issue a getmap request encoded in xml, which contains an sld.
to the best of my knowledge, an xml post encoding has not yet been defined. all i could find in the 1.1.1 wms spec is the following: "The specification will be expanded with a Part 2 to support operation requests using HTTP POST." there seems to be some 'translation' of the request in the sld spec, but i don't know that the 1.2.0 wms ever came to be.
is there an accepted schema/dtd for posting a getmap request?