An experimental SPARQL endpoint for whatsplayingnext.com is at http://whatsplayingnext.com/sparql. /sparql takes a ?query= argument. You can prepare your query with this form.
The dataset is currently only today's movie showtimes for my local area, which is about 1000 tiples.
/sparql returns application/sparql-results+xml or text/html depending
on your Accept: header. To test the xml results, you could escape a
query by submitting this form and then putting it into a command-line
like this:
curl -H "Accept: application/sparql-results+xml" "..."
Maintained by drewp@bigasterisk.com. See the todo list.