Bio::DB::Taxonomy - Access to a taxonomy database


  use Bio::DB::Taxonomy;
  my $db = Bio::DB::Taxonomy->new(-source => 'entrez');
  # use NCBI Entrez over HTTP
  my $taxonid = $db->get_taxonid('Homo sapiens');

  # get a taxon
  my $taxon = $db->get_taxon(-taxonid => $taxonid);


This is a front end module for access to a taxonomy database.


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AUTHOR - Jason Stajich



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The rest of the documentation details each of the object methods. Internal methods are usually preceded with a _


 Title   : new
 Usage   : my $obj = Bio::DB::Taxonomy->new(-source => 'entrez');
 Function: Builds a new Bio::DB::Taxonomy object.
 Returns : an instance of Bio::DB::Taxonomy
 Args    : -source => which database source 'entrez' (NCBI taxonomy online),
                      'flatfile' (local NCBI taxonomy), 'greengenes' (local
                      GreenGenes taxonomy), 'silva' (local Silva taxonomy), or
                      'list' (Do-It-Yourself taxonomy)


 Title   : get_num_taxa
 Usage   : my $num = $db->get_num_taxa();
 Function: Get the number of taxa stored in the database.
 Returns : A number
 Args    : None


 Title   : get_taxon
 Usage   : my $taxon = $db->get_taxon(-taxonid => $taxonid);
 Function: Get a Bio::Taxon object from the database.
 Returns : Bio::Taxon object
 Args    : just a single value which is the database id, OR named args:
           -taxonid => taxonomy id (to query by taxonid)
           -name    => string (to query by a taxonomy name: common name, 
                       scientific name, etc)


 Title   : get_taxonids
 Usage   : my @taxonids = $db->get_taxonids('Homo sapiens');
 Function: Searches for a taxonid (typically ncbi_taxon_id) based on a query
           string. Note that multiple taxonids can match to the same supplied
 Returns : array of integer ids in list context, one of these in scalar context
 Args    : string representing the taxon's name


 Title   : get_tree
 Usage   : my $tree = $db->get_tree(@species_names);
 Function: Generate a tree comprised of the full lineages of all the supplied
           species names. The nodes for the requested species are given
           name('supplied') values corresponding to the supplied name, such that
           they can be identified if the real species name in the database
           (stored under node_name()) is different. The nodes are also given an
           arbitrary branch length of 1.
 Returns : Bio::Tree::Tree
 Args    : A list of species names (strings) to include in the tree.


 Title   : ancestor
 Usage   : my $ancestor_taxon = $db->ancestor($taxon);
 Function: Retrieve the full ancestor taxon of a supplied Taxon from the
 Returns : Bio::Taxon
 Args    : Bio::Taxon (that was retrieved from this database)


 Title   : each_Descendent
 Usage   : my @taxa = $db->each_Descendent($taxon);
 Function: Get all the descendents of the supplied Taxon (but not their
           descendents, ie. not a recursive fetchall).
 Returns : Array of Bio::Taxon objects
 Args    : Bio::Taxon (that was retrieved from this database)


 Title   : get_all_Descendents
 Usage   : my @taxa = $db->get_all_Descendents($taxon);
 Function: Like each_Descendent(), but do a recursive fetchall
 Returns : Array of Bio::Taxon objects
 Args    : Bio::Taxon (that was retrieved from this database)


 Title   : _load_tax_module
 Usage   : *INTERNAL Bio::DB::Taxonomy stuff*
 Function: Loads up (like use) a module at run time on demand


 Title   : _handle_internal_id
 Usage   : *INTERNAL Bio::DB::Taxonomy stuff*
 Function: Add an internal ID to a taxon object, ensuring that the taxon gets
           the same internal ID, regardless of which database it is retrieved
 Returns : The assigned internal ID
 Args    : * A Bio::Taxon
           * An optional boolean to decide whether or not to try and do the job
             using scientific name & rank in addition to taxon ID. This is
             useful if your IDs are not comparable to that of other databases,
             e.g. if they are arbitrary, as in the case of Bio::DB::Taxonomy::list.
             CAVEAT: will handle ambiguous names within a database fine, but not
             across multiple databases.