NAME

         GO::Model::GraphIterator - Graph iterator

SYNOPSIS

         $it = $graph->create_iterator;
         # returns a GO::Model::GraphIterator object

         while (my $ni = $it->next_node_instance) {
           $depth = $ni->depth;
           $term = $ni->term;
           $reltype = $ni->parent_rel->type;
           printf
             "%s %8s Term = %s (%s)  // depth=%d\n",
                 "----" x $depth,
                 $reltype,
                 $term->name,
                 $term->public_acc,
                 $depth;
         }

DESCRIPTION

SEE ALSO

       GO::Model::Graph

       GO::Model::GraphNodeInstance

   order
         Usage   - $graphiter->order("breadth");
         Returns - string
         Args    - string

       gets/sets traversal order; breadth or depth; default is depth

   direction
         Usage   - $graphiter->direction("up");
         Returns - string
         Args    - string

       gets/sets direction; default is "down"

   compact
         Usage   - $graphiter->compact(1);
         Returns - bool
         Args    - bool

       set this if you dont want relationships to be traversed twice; this gives a more compact
       tree representation of the graph

   reltype_filter
         Usage   - $graphiter->reltype_filter(qw(is_a part_of))
         Returns - array
         Args    - array

       by default, all relationship types are treated as transitive, and will be traversed by the
       iterator

       sometimes you dont want to traverse all relations, even if they are transitive. For
       example, when answering the query "find all genes expressed in the embryo" you way want
       subtypes of embryo and parts of the embryo but not things that develop_from the embryo.

       For more details, see
       <http://sourceforge.net/mailarchive/forum.php?thread_id=9448679&forum_id=43082>

   reset_cursor
         Usage   -
         Returns -
         Args    -

   next_node
         Usage   -
         Returns - GO::Model::Term
         Args    -

   next_node_instance
         Usage   -
         Returns - GO::Model::GraphNodeInstance
         Args    -

   flatten
         Usage   -
         Returns -
         Args    -

   _sortby_pos_in_list
       Careful, this sort function work on Term objects, not GraphNodeInstance objects.
       Comparison is done by the name of the term.