gpgme: how to interpret signature.status / documentation problem

[Bernhard Reiter]

info gpgme-1.1.6
tells me 

   `gpgme_error_t status'
          This is the status of the signature.  In particular, the
          following status codes are of interest:

         `GPG_ERR_NO_ERROR'
               This status indicates that the signature is valid.  For
               the combined   result this status means that all
               signatures are valid.

         `GPG_ERR_SIG_EXPIRED'
[..]

What I cannot find the constants defined in gpgme.
The documentation seems outdate. How to I interpret the status values?
(I would want a string representation as well, if possible.) :) 

E.g. what do the following values indicate
signature 1 :
  summary:     0x800  (this is GPGME_SIGSUM_SYS_ERROR)
  status:      0x7000001

Thanks,
Bernhard

-- 
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