diff --git a/src/fr/inrialpes/exmo/align/impl/renderer/RDFRendererVisitor.java b/src/fr/inrialpes/exmo/align/impl/renderer/RDFRendererVisitor.java
index 2795d893f0f5eb8aefa13ceef15207755d357fe6..8e91826861eda8b8f322bdf6b75278b40308c8ee 100644
--- a/src/fr/inrialpes/exmo/align/impl/renderer/RDFRendererVisitor.java
+++ b/src/fr/inrialpes/exmo/align/impl/renderer/RDFRendererVisitor.java
@@ -158,7 +158,7 @@ public class RDFRendererVisitor implements AlignmentVisitor
 	     || alignment.getLevel().equals("2OMWG") ){
 	    writer.print("  <map>\n");
 	    writer.print("    <Cell");
-	    if ( cell.getId() != null ){
+	    if ( cell.getId() != null && !cell.getId().equals("") ){
 		writer.print(" rdf:about=\""+cell.getId()+"\"");
 	    }
 	    writer.print(">\n");