Re: total number of results

> 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.