setProperty( StyleRule.OPERATOR_MEMBER, operator );
ActivityStack stack = getModule( ).getActivityStack( ); stack.startTrans( ); try { setProperty( StyleRule.OPERATOR_MEMBER, operator ); int level = OperatorUtil.computeStyleRuleOperatorLevel( operator ); switch ( level ) { case OperatorUtil.OPERATOR_LEVEL_ONE : setValue2( null ); break; case OperatorUtil.OPERATOR_LEVEL_TWO : break; case OperatorUtil.OPERATOR_LEVEL_ZERO : setValue2( null ); setValue1( null ); break; case OperatorUtil.OPERATOR_LEVEL_NOT_EXIST : break; } } catch ( SemanticException e ) { stack.rollback( ); throw e; }  stack.commit( );
	public void setOperator( String operator ) throws SemanticException	{		setProperty( StyleRule.OPERATOR_MEMBER, operator );	}