User-agent: Googlebot
Disallow: /smf/*?action
Disallow: /smf/*sort=
Disallow: /smf/*msg
Allow: /smf/index.php?action=sitemap;xml

User-agent: Slurp
Disallow: /smf/*?action
Disallow: /smf/*sort=
Disallow: /smf/*msg
Allow: /smf/index.php?action=sitemap;xml

User-agent: *
Disallow: /smf/index.php?action