code: package it.unibz.inf.ontop.model.term.functionsymbol.impl;
  
  import com.google.common.collect.ImmutableList;
  import it.unibz.inf.ontop.model.term.ImmutableExpression;
  import it.unibz.inf.ontop.model.term.ImmutableTerm;
  import it.unibz.inf.ontop.model.term.TermFactory;
  import it.unibz.inf.ontop.model.type.DBTermType;
  import it.unibz.inf.ontop.model.type.RDFDatatype;
  import it.unibz.inf.ontop.model.type.RDFTermType;
  import it.unibz.inf.ontop.model.vocabulary.SPARQL;
  
  import javax.annotation.Nonnull;
  
  public class NonStrictEqSPARQLFunctionSymbolImpl extends AbstractBinaryComparisonSPARQLFunctionSymbol {
  
  
      private final RDFDatatype xsdBooleanType;
      private final DBTermType dbBooleanType;
  
      protected NonStrictEqSPARQLFunctionSymbolImpl(@Nonnull RDFTermType rdfRootType, RDFDatatype xsdBooleanType,
                                                    DBTermType dbBooleanType) {
          super("SP_NON_STRICT_EQ", SPARQL.EQ, rdfRootType, xsdBooleanType);
          this.xsdBooleanType = xsdBooleanType;
          this.dbBooleanType = dbBooleanType;
      }
  
      @Override
      protected ImmutableTerm computeLexicalTerm(ImmutableList<ImmutableTerm> subLexicalTerms,
                                                 ImmutableList<ImmutableTerm> typeTerms, TermFactory termFactory) {
          ImmutableExpression expression = termFactory.getLexicalNonStrictEquality(subLexicalTerms.get(0), typeTerms.get(0),
                  subLexicalTerms.get(1), typeTerms.get(1));
          return termFactory.getConversion2RDFLexical(dbBooleanType, expression, xsdBooleanType);
      }
  }
  