问用撒克逊XPath S9API评估S9API 2.0表达式

EN

public class XPath2Test {

public static void main(String[] args) throws Exception{

    String assemblyXPathString="/child::AssemblyBase/child::Assembly[attribute::roles='ALL' or contains(attribute::roles,$role)]";

    DOMParser parser=new DOMParser();
    FileInputStream fis=new FileInputStream("E:\\workspaces\\dev_werewolf\\Platform_Manual\\manual\\UIFramework\\RoleBasedUIAssembly2.xml");
    InputSource inputSource=new InputSource(fis);
    parser.parse(inputSource);
    Document document=parser.getDocument();


    Processor processor=new Processor(false);
    //processor.newDocumentBuilder().build(new File("E:\\workspaces\\dev_werewolf\\Platform_Manual\\manual\\UIFramework\\RoleBasedUIAssembly2.xml"));

    XPathCompiler compiler=processor.newXPathCompiler();
    compiler.declareVariable(new QName("role"));

    XPathExecutable executable=compiler.compile(assemblyXPathString);
    XPathSelector selector=executable.load();
    ArrayList<String> values=new ArrayList<>();
    values.add("CIO");
    selector.setVariable(new QName("role"),   XdmItem.makeSequence(values));

    //Now what???, how to run the quesry against the 'document'???
    selector.evaluate();//Exception

}//main closing

}//class closing