code: package it.unibz.inf.ontop.iq.node;
  
  import it.unibz.inf.ontop.injection.IntermediateQueryFactory;
  import it.unibz.inf.ontop.iq.LeafIQTree;
  import it.unibz.inf.ontop.iq.exception.QueryNodeTransformationException;
  import it.unibz.inf.ontop.iq.transform.node.HomogeneousQueryNodeTransformer;
  
  /**
   * See {@link IntermediateQueryFactory#createTrueNode()} for creating a new instance.
   */
  public interface TrueNode extends LeafIQTree {
      @Override
      TrueNode acceptNodeTransformer(HomogeneousQueryNodeTransformer transformer)
              throws QueryNodeTransformationException;
  }
  