InterpretPage:
PROC [handle: PDInterpReader.Handle, request: PDQueue.Request, abort:
LONG
POINTER
TO
BOOLEAN]
RETURNS [ok:
BOOLEAN];
Interprets one page (may be multiple passes), and ships it out.
May raise PDInterpReader.Warning or PDInterpReader.Error or PDInterpOutput.Error or PDInterpInput.Abort
Does not call PDInterpInput.ReportStatus.
Returns FALSE upon document end.