code: public List getMulti(String attribute) {
  	NameOpValue nv = rslTree.getParam(attribute);
  	if (nv == null || nv.getOperator() != NameOpValue.EQ) return null;
  	List values = nv.getValues();
  	List list = new LinkedList();
  	Iterator iter = values.iterator();
  	Object obj;
  	while( iter.hasNext() ) {
  	    obj = iter.next();
  	    if (obj instanceof Value) {
  		list.add( ((Value)obj).getCompleteValue() );
  	    }
  	}
  	return list;
      }
docs: Returns a list of strings for a specified attribute.
  For example for 'arguments' attribute.
  
  @param attribute the rsl attribute to return the values of.
  @return the list of values of the relation. Each value is
  a string. Null is returned if there is no such
  attribute or the attribute/values relation is not
  an equality relation.