[xml] XML callback functions

I am writting a class that will use XML::LibXML and I am using the
callback methods in order
to feed it a dtd. I need to know if I can give the callback a method
call instead of a reference to
a sub-routine.

Where I would


can I say;

my $self = {};

bless $self, $class;


sub mycustommethod {
    my $self = $_[0];
    my $handle = $_[1];
    my $length = $_[2];
    my $buffer;

    read ($self->{IOSTREAM}, $buffer, $length);
    return $buffer;

Will something like this work or is there a better way.

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