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=head2 Support 

Please direct usage questions or support issues to the mailing list:

I<bioperl-l@bioperl.org>

rather than to the module maintainer directly. Many experienced and 
reponsive experts will be able look at the problem and quickly 
address it. Please include a thorough description of the problem 
with code and data examples if at all possible.

=head2 Reporting Bugs

Report bugs to the Bioperl bug tracking system to help us keep track
the bugs and their resolution.  Bug reports can be submitted via the
web:

  https://github.com/bioperl/bioperl-live/issues

=head1 AUTHOR - Ewan Birney

Email birney@ebi.ac.uk

=head1 APPENDIX

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

=cut

#'
# Let the code begin...


package Bio::AnnotationI;
use strict;

# Object preamble - inherits from Bio::Root::Root

use base qw(Bio::Root::RootI);

=head2 as_text

 Title   : as_text
 Usage   :
 Function: single text string, without newlines representing the
           annotation, mainly for human readability. It is not aimed
           at being able to store/represent the annotation.
 Example :
 Returns : a string
 Args    : none


=cut

sub as_text{
    shift->throw_not_implemented();
}

=head2 display_text

 Title   : display_text
 Usage   : my $str = $ann->display_text();
 Function: returns a string. Unlike as_text(), this method returns a string
           formatted as would be expected for the specific implementation.

           Implementations should allow passing a callback as an argument which
           allows custom text generation; the callback will be passed the
           current implementation.

           Note that this is meant to be used as a simple representation
           of the annotation data but probably shouldn't be used in cases
           where more complex comparisons are needed or where data is
           stored.
 Example :
 Returns : a string
 Args    : [optional] callback

=cut

sub display_text {
    shift->throw_not_implemented();
}

=head2 hash_tree

 Title   : hash_tree
 Usage   :
 Function: should return an anonymous hash with "XML-like" formatting
 Example :
 Returns : a hash reference
 Args    : none

=cut

sub hash_tree{
    shift->throw_not_implemented();
}

=head2 tagname

 Title   : tagname
 Usage   : $obj->tagname($newval)
 Function: Get/set the tagname for this annotation value.

           Setting this is optional. If set, it obviates the need to
           provide a tag to Bio::AnnotationCollectionI when adding
           this object. When obtaining an AnnotationI object from the
           collection, the collection will set the value to the tag
           under which it was stored unless the object has a tag
           stored already.

 Example :
 Returns : value of tagname (a scalar)
 Args    : new value (a scalar, optional)


=cut

sub tagname{
    shift->throw_not_implemented();
}

1;