NAME

         GO::Model::Evidence - evidence for an association

SYNOPSIS

         my $ev_l = $association->evidence_list;
         foreach my $ev (@$ev_l) {
           print "Evidence for association %s : %s\n",
             $association->gene_product->symbol,
             $ev->code;
         }

DESCRIPTION

       evidence for an association

       see http://www.geneontology.org/GO.evidence.html for a list of evidence codes

   code
         Usage   - $ev->code("IEA");
         Returns -
         Args    -

       gets/sets the evidence code

       see http://www.geneontology.org/GO.evidence.html

   seq_acc
         Usage   -
         Returns -
         Args    -

       gets/sets the sequence accesion GO::Model::Xref

       ALPHA CODE  - API may change

       used to set the GO::Model::Xref list from a text string. eg

         $ev->seq_acc("SGD:RRP41; SGDID:L0003550");

       will actually add two GO::Model::Xref objects

       This method doesnt really belong in the GO::Model::* hierarchy as it contains parsing
       code. Its a minor hack mainly due to the fact that this data is still denormalized in the
       database.

   add_seq_xref
         Usage   -
         Returns -
         Args    -

       equivalent to WITH column in gene_association files, and evidence_dbxref tables in db

   add_pub_xref
         Usage   -
         Returns -
         Args    -

   xref
         Usage   -
         Returns -
         Args    -

       gets/sets the literature or sequence reference GO::Model::Xref

       NOTE: at some point we may want to deprecate this method and persuade API client code to
       call

         $ev->literature_xref

       instead, to make explicit the fact that this is a literature reference as opposed to a
       sequence reference

   xref_list
         Usage   -
         Returns - GO::Model::Xref listref
         Args    -

       returns all (sequence and literature) references

   xref
         Usage   -
         Returns -
         Args    -

       deprected - sets first pub_xref_list

   valid_codes
         Usage   - print join("; ", GO::Model::Evidence->valid_codes);
         Returns - string array
         Args    -

       list of valid evidence codes