String length = lengthSparqlAtom.getObject();
String sparql = "<http://www.w3.org/2005/xpath-functions#substring> (" + uriResourceString + ", "
+ start + ", " + length + ")";
return (T) new SPARQLFunction(sparql);
} catch (UnsupportedTypeForExportException e) {
throw new org.apache.stanbol.rules.base.api.RuleAtomCallExeption(getClass());
} catch (UnavailableRuleObjectException e) {
throw new org.apache.stanbol.rules.base.api.RuleAtomCallExeption(getClass());