[jxpath] problem with predicates

[joern turner]

hello,

i've got a problem evaluating predicates when used in conjunction with 
relative contexts.

here the xml-input i'm using:
<people>
    <person name="Name1"></person>
    <person name="Name2"></person>
    <person name="Name3"></person>
    <person name="Name4"></person>
    <new name="NameX"></new>
</people>
here's the code:

//document is a DOM containing the above xml
JXPathContext rootContext = JXPathContext.newContext(document);
//the xpath must be evaluated relative to pointer
Pointer pointer = rootContext.getPointer("/people/new/@name");
JXPathContext relativeContext =
      rootContext.getRelativeContext(this.pointer);
//ok 
assertTrue(relativeContext.getPointer("not(//person/@name=.)").getValue().toString().equals("true"));

//fails
this.pointer.setValue("Name1"); 
assertTrue(relativeContext.getPointer("not(//person/@name=.)").getValue().toString().equals("false"));

i've tried this and that but with no success. can someone shed some 
light on this or teach me what i'm doing wrong?

thanks,

Joern

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