Java – VTD XML internal XPath expression

I have an XML file like this

<root>
 <test>
  <bla>test1</bla>
 </test>
 <test>
  <bla>test2</bla>
 </test>
 <test>
 </test>
</root>

Now I want to parse it using VTD XML parser by using an XPath expression First, I search for test tags

VTDNav vn = vg.getNav();
AutoPilot ap = new AutoPilot(vn);
ap.selectXPath("//test");

Now I want to search for the BLA tag in this test tag

int result = -1;
int count = 0;

while ((result = ap.evalXPath()) != -1) {
 // evaluate XPath Expressions within the test tags
}

Can someone tell me how to make this expression? I don't want to search the whole document for BLA tags because I want to be able to assign BLA tags to test tags If the BLA tag is empty, I can't do this. I search for BLA tags throughout the document

Solution

You can declare another autopilot (shown below), although it is not always the easiest way

AutoPilot ap2 = new AutoPilot(); ap2.selectXPath("blah");

It is then nested in a loop

while ((result = ap.evalXPath()) != -1) {
 // evaluate XPath Expressions within the test tags
  int i2=-1;
  while((i2=ap2.evalXPath())!=-1){
     // do more stuff here
  }
}

But the problem is that the second XPath needs to be a relative XPath expression