SQL92's LIKE predicate also has an optional ESCAPE argument. So, in regards to CMIS SQL, what are the like string escaping rules? As there is no way to specify an escape character in the grammar, is it simply not allowed (as in SQL92 without the ESCAPE clause)? Or is there some default escape character? What does it escape (i.e. just % and _, or does it escape quotes (which will modify the entire BNF, I think)?