Forum OpenACS Q&A: Finding out where a package is mounted

I'm needing to find out where a certain package is mounted. Jim Lynch shared this query with me on the #openacs IRC channel that finds that out:

       select site_node__url(n.node_id)
         from site_nodes n, apm_packages p
        where p.package_id = n.object_id
          and p.package_key = 'package_key'

I'm wondering if there's an api call somewhere that does that already, or if there's a better way to find out that information. If not, perhaps we should consider adding a proc to the core that would do it?