[Bioperl-l] Structure::IO

[Bernd Web]

Hi,

Does someone have experience with Bio::Structure::IO?
The example III.9.1 from the bptutorial.pl covers most, but what is e.g. the
chain() method of Bio::Structure::Entry doing? The POD states:

 Title   : chain
 Usage   : @chains  = $structure->chain($chain);
 Function: Connects a (or a list of) Chain objects to a Bio::Structure::Entry.
 Returns : list of Bio::Structure::Residue objects
 Args    : One Residue or a reference to an array of Residue objects

But in e.g
my $stream = Bio::Structure::IO->new(-file => $filename,
			-format => 'pdb');
while ( my $struc = $stream->next_structure() ) {
    for my $chain ($struc->get_chains) {
	my $chainid = $chain->id;
	my @chains = $struc->chain($chain);
   }
}

I get Bio::Structure::Chain=HASH(0x9f1ab50).

What is the function of the chain method and how to use it?

Best regards,
bernd