connectby documentation

Hi,

I'm searching for an Oracle START WITH ... CONNECT BY PRIOR ...
equivalence.  It seems that PostgreSQL (version >= 7.4) supports a
function connectby that provides similar feature.  Unfortunately I don't
find any documentation on that function.  Could you please give me a
link on such documentation?

Note: Just an example of the Oracle START WITH ... CONNECT BY PRIOR ...
behaviour.
         4        |         |        |         2        |        / \       |       1   3      | Hierarchy dependency
order     / \  |      |     5   | 6      |         |/       |         7        V 
 SELECT JobId, JobParentId   FROM JobDependency   START WITH JobParentId IN (     _Root_Datamarts_ )   CONNECT BY PRIOR
JobId= JobParentId 
 JOBID JOBPARENTID ----- -----------     2           4     1           2     5           1     7           1     3
    2     6           3     7           6 

Regards,


--
Daniel