12. QbEx with constraints <q: Query > <q: template > <r: R estaurant > <r: type rdf: resource =“ r#Tandoori " /> <r: open-time > <cif: V ariable rdf: ID =" x "> <cif: varname > x </cif: varname > </cif: V ariable > </r: open-time > </r: R estaurant > </q: template > <q: constraints > <cif: C omparison > <cif: comparison O perator > > </cif: comparison O perator > <cif: comparison O p1 > <cif: V ariable rdf: about =" #x "/> </cif: comparison O p1 > <cif: comparison O p2 > <cif: I ntegerconst > <cif: constant V alue > 1900 </cif: constant V alue > .. . . Give me a Restaurant that is open after X, where X > 1900. i.e. Give me a restaurant open after 7 pm.