query to get the list of key (reserverd) words?

I'm in the unenviable position of needing to check various input to
ensure that it doesn't contain any PostgreSQL/SQL key words/reserved
words.

The initial implementation simply made a copy of this table:
http://www.postgresql.org/docs/8.3/static/sql-keywords-appendix.html#KEYWORDS-TABLE
into a static array in the code.  Obviously, this is non-optimal
because it becomes a manual chore to ensure the list is up to date
any time new PG releases are made.

Is there a pg_* or other table in the database that I can query for this
list?  Or some other automated method that can be employed?

--
Bill Moran
http://www.potentialtech.com
http://people.collaborativefusion.com/~wmoran/