added whitespace in SPARQL generation as needed by YARS2
added whitespace in SPARQL generation as needed by YARS2

mauriciobomfim/ActiveRDF,ActiveRDF/ActiveRDF,ActiveRDF/ActiveRDF,net7/ActiveRDF,net7/ActiveRDF,ActiveRDF/ActiveRDF,mauriciobomfim/ActiveRDF,net7/ActiveRDF,net7/ActiveRDF,mauriciobomfim/ActiveRDF