int xmlReaderMoveToElement(xmlReader reader)
0- not moved
-1- other error
xmlReaderMoveToElement() moves the reader back on to the element
after it has been moved on to one of its attributes.
If you want to advance the reader to the next node in the XML
<$ret = (xmlReaderMoveToElement($reader))>
The ordering of the attributes as provided by this function might NOT be the same as the ordering of the attributes in the XML document. This is legal, as the ordering of attributes is not significant in an XML document (see section 3.1 of the XML spec).