1 files changed, 27 insertions, 0 deletions
diff --git a/ast-to-instr/src/VHDLNode.java b/ast-to-instr/src/VHDLNode.java
index cb3fb4d..6c49cdf 100644
--- a/ast-to-instr/src/VHDLNode.java
+++ b/ast-to-instr/src/VHDLNode.java
@@ -1,5 +1,7 @@
 import org.w3c.dom.Node;
 
+import javax.xml.xpath.XPathExpressionException;
+
 public abstract class VHDLNode extends ParsableXML
 {
    protected final IDs next_node;
@@ -25,4 +27,29 @@ public abstract class VHDLNode extends ParsableXML
       this.attributes = attributes;
    }
 
+   protected void handle_expression
+   (
+      final IDs local_id,
+      final Node expression_ref
+   )
+   throws XPathExpressionException
+   {
+      final String ref;
+
+      ref = XMLManager.get_attribute(expression_ref, "ref");
+
+      if (!Main.node_is_function_or_literal(ref))
+      {
+         Predicates.add_entry
+         (
+            output,
+            predicate,
+            local_id,
+            Waveforms.get_associated_waveform_id
+            (
+               IDs.get_id_from_xml_id(ref, (String) null)
+            )
+         );
+      }
+   }
 }