However, many SPARQL implementations do extend the language with support for COUNT. Some examples include:<snip>More generally, I'm working to add information on this and other common SPARQL extensions to the ESW Wiki and the SPARQL FAQ; I'll post here when I've done that.
AllegroGraph also supports COUNT when queries are run in extended mode. You can also use the :count results format to get a count back from an ordinary SELECT query, which is a little less intrusive.
