[xml] xmlTextReaderRead and position movement

[Jeremy Enos <jenos ncsa uiuc edu>]

<noob issue>
I'm having a strange issue with xmlTextReaderRead.  The API text says it 
moves the position to the next node in the stream.  I use 
xmlTextReaderRead in loopA, and then in sub loopB within loopA as well.  
i.e.  I intend to read all the way through a given branch in loopB 
before returning to loopA and moving on.
However, it's not behaving as I expected.  I am querying the depth in 
each loop, and for some reason, after I call xmlTextReaderRead in loopB, 
it seems to reset to the top of the tree again.  Does this make sense?  
Is there a precise description of how xmlTextReaderRead works 
somewhere?  I'm most certainly missing something easy here.
</noob issue>
thx-

   Jeremy