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These simply get and set features, and throw the
appropriate exceptions defined in the specification if need be.

If your subclass defines features not defined in this one,
then you should override these methods in such a way that they check for
your features first, and then call the base class's methods
for features not defined by your class. An example would be:

  sub get_feature {
      my $self = shift;
      my $feat = shift;
      if (exists $MY_FEATURES{$feat}) {
          # handle the feature in various ways
      }
      else {
          return $self->SUPER::get_feature($feat);
      }
  }

Currently this part is unimplemented.

=back

It would be rather useless to describe all the methods that this
module implements here. They are all the methods supported in SAX1 and
SAX2. In case your memory is a little short, here is a list. The
apparent duplicates are there so that both versions of SAX can be
supported.

=over 4

=item * start_document

=item * end_document

=item * start_element

=item * start_document

=item * end_document

=item * start_element

=item * end_element

=item * characters

=item * processing_instruction

=item * ignorable_whitespace

=item * set_document_locator

=item * start_prefix_mapping

=item * end_prefix_mapping

=item * skipped_entity

=item * start_cdata

=item * end_cdata

=item * comment

=item * entity_reference

=item * notation_decl

=item * unparsed_entity_decl

=item * element_decl

=item * attlist_decl

=item * doctype_decl

=item * xml_decl

=item * entity_decl

=item * attribute_decl

=item * internal_entity_decl

=item * external_entity_decl

=item * resolve_entity

=item * start_dtd

=item * end_dtd

=item * start_entity

=item * end_entity

=item * warning

=item * error

=item * fatal_error

=back

=head1 TODO

  - more tests
  - conform to the "SAX Filters" and "Java and DOM compatibility"
    sections of the SAX2 document.

=head1 AUTHOR

Kip Hampton (khampton@totalcinema.com) did most of the work, after porting
it from XML::Filter::Base.

Robin Berjon (robin@knowscape.com) pitched in with patches to make it 
usable as a base for drivers as well as filters, along with other patches.

Matt Sergeant (matt@sergeant.org) wrote the original XML::Filter::Base,
and patched a few things here and there, and imported it into
the XML::SAX distribution.