xpath_list() function

Hi,

I have installed xml2 contrib to my postgreSQL 8.1.4 install. The
functionality it offer when working with xml files is really good, but i
currently experiencing a few issues with the xpath_list function and a
simple test.

I took a simple xml file (the one described in the PostgreSQL book by Korry
and Susan Douglas), just for testing purposes added an extra film with 2
year tags containing the values 1972 and 1973 . I can extract this
information with the xpath_list function which returns the following

testdb=# SELECT film_name, xpath_list(description, 'year') FROM filminfo;
film_name | xpath_list
--------------- +------------
Casablanca | 1942
Rear Window | 1954
The Godfather | 1972
Test film | 1973,1972

It would seem reasonable in this example that the 1973,1972 gained from
xpath_list could be reused in a WHERE clause like so

SELECT film_name WHERE '1973' IN (xpath_list(description, 'year'));

But the xpath_list function returns a single string
so the above query returns no rows. I can not find a way of splitting
the values returned from xpath_list
so that they can be used in an IN ()
clause, can anybody point me in the right direction for a method that can
split the result, or offer me some advice on how to achieve it.

Thanks in advance,

Andy