column information from view

Hello,

I'm trying to generate a table with information from a temporary view
that simply selects a subset of columns from a persistent view in a
given schema. The persistent view joins a number of tables with columns
that may or may not have a description entered.

Here's my attempt at listing the temporary view's columns and respective
descriptions:

SELECT cols.ordinal_position, cols.column_name,
col_description(cl.oid, cols.ordinal_position::INT)
FROM pg_class cl, information_schema.columns cols
WHERE cols.table_catalog='dbname' AND cols.table_schema='some_schema' AND
cols.table_name = 'persistent_view' AND cols.table_name = cl.relname
ORDER BY cols.ordinal_position::INT;

The problem with this one, of course, is that it lists *all* columns
from the persistent view, instead of the subset of them in the temporary
view. Is there a better way to do that?

Thanks,
--
Seb