Replacing harcoded XML element attributes with variables

Question

Is there any way for Xpath expressions in JAVA to refer to variables (for an attribute) instead of harcoded strings (like 'abc' and 'xyz' below)
So below ... 'abc' , 'xyz' could be varaibles.....
String getServerInstance="/Accounts/Account[@code='abc']/TestingProgram[@code='abc']/Modes/Mode[@code='xyz']/*";
Thanks a lot

Answer 1

I have a class now that resolves variables:
public class Resolve_Xpath_Vars implements XPathVariableResolver
     public Object resolveVariable(QName var)
try {          
          if (var.equals(new QName("pqr")))
                    return new String("pqr");
          else if (var.equals(new QName("abcde")))
                    return new String("abcde");
else
return null;
catch (Exception ex)
          ex.printStackTrace();
          throw new RuntimeException();     
NOWWWWW
how do i configure my XPATH expression to call this class to reolve my varaible....
XPATH EXPRESSION IS:
"this.Account" is the variable that the class should resolve.....to "pqr"
String getAccnt="/Accounts/Account[@code="+"'"+*this.Account*+"'"+"]/*";      
Once resolved to "pqr" then i can make the following call:
NodeList nodeList =(NodeList) xPath.evaluate(getAccnt, inputSource, XPathConstants.NODESET );
any help is appreciated.............