edited a couple of comments in accordance with posting on the mailing list

* xmlschemas.c: edited a couple of comments in accordance with
  posting on the mailing list (no logic change)
* xpointer.c: working on Bug 129967, added check for NULL
  nodeset to prevent crash.  Further work required.
* xpath.c: working on Bug 129967, added code to handle
  XPATH_LOCATIONSET in RANGETO code, also added code to
  handle it in xmlXPathEvaluatePredicateResult.  Further
  work required.
4 files changed