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ParserFactory. They may or may not be implemented at a later date
(the most likely candidates are the exception classes, for which I
still have to find an appropriate model).

Some places differ slightly from what is in the spec. I have tried to
keep those to a justified minimum and to flag them correctly.

=head2 the CSS::SAC module itself

The Parser class doesn't exist separately, it's defined in CSS::SAC.
It doesn't expose the locale interface because we don't localize
errors (yet). It also doesn't have C<parse_style_sheet> but rather
C<parse>, which is more consistent with other Perl parsing interfaces.

I have added the C<charset($charset)> callback to the DocumentHandler
interface. There are valid reasons why it wasn't there (it can be
trusted only ever so often, and one should look at the actual encoding
instead) but given that it's a token in the grammar, I believe that
there should still be a way to access it.

=head1 METHODS