package MyPackage;

use strict;
use warnings 'all';

# This would import rpc_method into the current namespace:
use XMLMethod 'rpc_method';

# Declare a method as rpc-able:
rpc_method(
  'math.sum',
  \&API::Math::sum,
  [qw/ int int int /]
);

# Or maybe:
rpc_method
  name      => 'math.sum',
  method    => \&API::Math::sum,
  signature => [qw/ @int /];

rpc_method
  name      => 'math.avg',
  method    => \&API::Math::avg,
  signature => [qw/ @int /];

rpc_method
  name      => 'string.join',
  method    => \&join,
  signature => [qw/ @str /];