[Bioperl-l] OBOEngine does not have the function parse()

[Fenglou Mao]

Dear all.

I am tring to run the code below:
  use Bio::Ontology::OBOEngine;

  my $parser = Bio::Ontology::OBOEngine->new
        ( -file => "gene_ontology.1_2.obo" );

  my $engine = $parser->parse();


I got an error message:
Can't locate object method "parse" via package "Bio::Ontology::OBOEngine" at ./GO4.pl line 12.

I checked the source code, it seems this function "parse" cannot be found anywhere.
Any idea? My BioPerl version is 1.6.901

Fenglou