code: public int getPositionInContextNodeList(XPathContext xctxt)
    {
  
      // System.out.println("FuncPosition- entry");
      // If we're in a predicate, then this will return non-null.
      SubContextList iter = m_isTopLevel ? null : xctxt.getSubContextList();
  
      if (null != iter)
      {
        int prox = iter.getProximityPosition(xctxt);
   
        // System.out.println("FuncPosition- prox: "+prox);
        return prox;
      }
  
      DTMIterator cnl = xctxt.getContextNodeList();
  
      if (null != cnl)
      {
        int n = cnl.getCurrentNode();
        if(n == DTM.NULL)
        {
          if(cnl.getCurrentPos() == 0)
            return 0;
            
          // Then I think we're in a sort.  See sort21.xsl. So the iterator has 
          // already been spent, and is not on the node we're processing. 
          // It's highly possible that this is an issue for other context-list 
          // functions.  Shouldn't be a problem for last(), and it shouldn't be 
          // a problem for current().
          try 
          { 
            cnl = cnl.cloneWithReset(); 
          }
          catch(CloneNotSupportedException cnse)
          {
            throw new org.apache.xml.utils.WrappedRuntimeException(cnse);
          }
          int currentNode = xctxt.getContextNode();
          // System.out.println("currentNode: "+currentNode);
          while(DTM.NULL != (n = cnl.nextNode()))
          {
            if(n == currentNode)
              break;
          }
        }
        // System.out.println("n: "+n);
        // System.out.println("FuncPosition- cnl.getCurrentPos(): "+cnl.getCurrentPos());
        return cnl.getCurrentPos();
      }
  
      // System.out.println("FuncPosition - out of guesses: -1");
      return -1;
    }
docs: Get the position in the current context node list.
  
  @param xctxt Runtime XPath context.
  
  @return The current position of the itteration in the context node list,
  or -1 if there is no active context node list.