update with recursive query

Is it possible to execute an update using recursion?  I need to update a set of records and also update their children
withthe same value.  I tried the following query but it gave an error at the "update schema.table tbl":<br /><br />   
withrecursive childTbl( pid,<br />                             ppid,<br />                             proc_id,<br
/>                            other_id )<br />     as  ( select prc.pid,<br />                  prc.ppid,<br />
                 prc.proc_id,<br />                  prc.other_id<br />            from 
my_schema.prc_tbl              prc<br />            where ( ( prc.proc_path          like '%stuff%' )<br
/>             or    ( prc.proc_parameters    like '%stuff%' ) )<br />              and  ( prc.other_id is null )<br
/>          union all<br />           select prcsub.pid,<br />                  prcsub.ppid,<br />                 
prcsub.proc_id,<br/>                  prcsub.other_id<br />            from  childTbl                        prcpar,<br
/>                  my_schema.prc_tbl               prcsub<br />            where ( prcsub.ppid                 =
prcpar.pid)<br />         )<br />   update my_schema.prc_tbl  prc<br />     set   other_id       = 101<br />     from 
childTbl<br/><br />However, if I do a "select * from childTbl" it works.  The docs take about updates and talk about
recursivequeries with selects but nothing seems to cover the joining of the two.<br /><br />Thanks<br /><br />