+ Revision 1.12 2004/11/24 14:53:10 liekweg
+ Annotated after writing Tech Report
+
+ Revision 1.11 2004/11/02 14:30:56 liekweg
+ Re-allow multi-input join
+
+ Revision 1.10 2004/10/29 18:52:32 liekweg
+ Allow only two values for join
+
+ Revision 1.9 2004/10/29 18:38:36 liekweg
+ ** Allow store ::= ((valref|select),valref)
+