Map<InterpolationVariable, Integer> ivs = new HashMap<InterpolationVariable, Integer>();
RuleModel rm = new RuleModel();
for ( IPattern pattern : column.getDefinition() ) {
rm.addLhsItem( pattern );
}
RuleModelVisitor rmv = new RuleModelVisitor( ivs );
rmv.visit( rm );
return ivs.size() > 0;
}