code: @Override
      protected void doInitInputLocation(WstxInputData reader)
      {
          reader.mCurrInputProcessed = mContentStart.getCharacterOffset();
          reader.mCurrInputRow = mContentStart.getLineNumber();
          /* 13-Apr-2005, TSa: Since column offsets reported by Location
           *   objects are 1-based, but internally we use 0-based counts,
           *   need to offset this start by 1 to begin with.
           */
          reader.mCurrInputRowStart = -mContentStart.getColumnNumber() + 1;
      }
docs: Unlike with reader source, we won't start from beginning of a file,
  but usually from somewhere in the middle...