2 files changed, 19 insertions, 5 deletions

diff --git a/src/main/scala/uk/ac/ox/cs/rsacomb/RSAOntology.scala b/src/main/scala/uk/ac/ox/cs/rsacomb/RSAOntology.scala
index 7b4b142..0fb6c96 100644
--- a/src/main/scala/uk/ac/ox/cs/rsacomb/RSAOntology.scala
+++ b/src/main/scala/uk/ac/ox/cs/rsacomb/RSAOntology.scala
@@ -11,6 +11,7 @@ import org.semanticweb.owlapi.model.{OWLOntology, OWLAxiom, OWLLogicalAxiom}
 import org.semanticweb.owlapi.model.{
   OWLClass,
   OWLClassExpression,
+  OWLDataPropertyAssertionAxiom,
   OWLObjectProperty,
   OWLSubObjectPropertyOfAxiom,
   OWLObjectPropertyExpression,
@@ -35,7 +36,8 @@ import tech.oxfordsemantic.jrdfox.logic.expression.{
   Term,
   Variable,
   IRI,
-  Resource
+  Resource,
+  Literal
 }
 import tech.oxfordsemantic.jrdfox.logic.sparql.statement.SelectQuery
 
@@ -117,6 +119,12 @@ class RSAOntology(val ontology: OWLOntology) {
       .map(implicits.RDFox.owlapiToRdfoxIri)
       .toList
 
+  val literals: List[Literal] =
+    abox
+      .collect { case a: OWLDataPropertyAssertionAxiom => a }
+      .map(_.getObject)
+      .map(implicits.RDFox.owlapiToRdfoxLiteral)
+
   val concepts: List[OWLClass] =
     ontology.getClassesInSignature().asScala.toList
 
@@ -288,7 +296,7 @@ class RSAOntology(val ontology: OWLOntology) {
   }
 
   def filteringProgram(query: ConjunctiveQuery): FilteringProgram =
-    new FilteringProgram(query, individuals)
+    new FilteringProgram(query, individuals ++ literals)
 
   lazy val canonicalModel = new CanonicalModel(this)
 
diff --git a/src/main/scala/uk/ac/ox/cs/rsacomb/sparql/ConjunctiveQueryAnswers.scala b/src/main/scala/uk/ac/ox/cs/rsacomb/sparql/ConjunctiveQueryAnswers.scala
index 327ae8e..3db5500 100644
--- a/src/main/scala/uk/ac/ox/cs/rsacomb/sparql/ConjunctiveQueryAnswers.scala
+++ b/src/main/scala/uk/ac/ox/cs/rsacomb/sparql/ConjunctiveQueryAnswers.scala
@@ -1,6 +1,11 @@
 package uk.ac.ox.cs.rsacomb.sparql
 
-import tech.oxfordsemantic.jrdfox.logic.expression.{IRI, Resource, Variable}
+import tech.oxfordsemantic.jrdfox.logic.expression.{
+  IRI,
+  Literal,
+  Resource,
+  Variable
+}
 
 /** A collections of answers to a query.
   *
@@ -27,8 +32,9 @@ class ConjunctiveQueryAnswers(
         val header = variables map (_.getName) mkString "\t"
         val body = answers
           .map(_.map {
-            case x: IRI => x.getIRI
-            case x      => x.toString
+            case x: IRI     => x.getIRI
+            case x: Literal => x.getLexicalForm
+            case x          => x.toString
           }.mkString("\t"))
           .mkString("\n")
         s"$header\n$body"