Bio::DB::BioSeqI(3pm)

Bio::DB::BioSeqI - Abstract interface for a sequence database

  #
  # get a database object somehow using a concrete class
  #

  $seq = $db->get_Seq_by_id('ROA1_HUMAN');

  #
  # $seq is a Bio::Seq object
  #

This is a pure interface class - in other words, all this does is define methods which other (concrete) classes will actually implement. The Bio::DB::BioSeqI class defines what methods a generic database class should have. At the moment it is just the ability to make Bio::Seq objects from a name (id) or a accession number. Ewan Birney originally wrote this class.
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The rest of the documentation details each of the object methods. Internal methods are usually preceded with a _
get_Seq_by_id

 Title   : get_Seq_by_id
 Usage   : $seq = $db->get_Seq_by_id('ROA1_HUMAN')
 Function: Gets a Bio::Seq object by its name
 Returns : a Bio::Seq object
 Args    : the id (as a string) of a sequence
 Throws  : "id does not exist" exception

get_Seq_by_acc

 Title   : get_Seq_by_acc
 Usage   : $seq = $db->get_Seq_by_acc('X77802');
 Function: Gets a Bio::Seq object by accession number
 Returns : A Bio::Seq object
 Args    : accession number (as a string)
 Throws  : "acc does not exist" exception