@Test
public void testFilter2()
                        throws XMLStreamException, FactoryConfigurationError, IOException {

    Filter result = parse( "v100/testfilter2.xml" );
    OperatorFilter opFilter = (OperatorFilter) result;
    PropertyIsLessThan prop = (PropertyIsLessThan) opFilter.getOperator();
    assertEquals( "DEPTH", ( (ValueReference) prop.getParameter1() ).getAsText() );
    assertEquals( "30", ( (Literal<?>) prop.getParameter2() ).getValue().toString() );
}