1 files changed, 7 insertions, 0 deletions
diff --git a/xsd/cxx/tree/elements.cxx b/xsd/cxx/tree/elements.cxx
index d5f03c0..04bff38 100644
--- a/xsd/cxx/tree/elements.cxx
+++ b/xsd/cxx/tree/elements.cxx
@@ -604,6 +604,13 @@ namespace CXX
     Boolean Context::
     polymorphic_p (SemanticGraph::Type& t)
     {
+      // ID/IDREF templates cannot be polymorphic.
+      //
+      if (!t.named_p () &&
+          (t.is_a<SemanticGraph::Fundamental::Id> () ||
+           t.is_a<SemanticGraph::Fundamental::IdRef> ()))
+        return false;
+
       if (polymorphic_all)
       {
         Boolean fund (false);