Regarding running Sparql in drupal

I have deployed RDF module in Drupal and have tagged the contents using that.

Now im trying to run the Sparql in Drupal using Sparql module .
While trying that it is asking for end-point.
I dont know what needs to be given as end-point.

I trying given end-point as "http//localhost/drupal"
"http//localhost/drupal/sparql"

it is not showing error on end-point but it is not retriving the data.
Getting error in drupal as " Unknown sparql result format :text/html"


Can anyone help us on giving end-point to sparql

thanks.