GSVEntity entity = model.entityNamed(entityName);
if(entity==null){
entity = new GSVEntity(model, entityName);
model.addEntity(entity);
}
GSVAttribute att = entity.attributeNamed(this.selectedAttribute().name());
if(att==null){
att = new GSVAttribute(entity, this.selectedAttribute().name());
entity.addAttribute(att);
}
att.removeRule(this.selectedRule());