missing dependency on python-jsonschema

If I try to start glance on 12.10, I get the following error:
$ sudo -H -u glance glance-api
Traceback (most recent call last):
  File "/usr/bin/glance-api", line 54, in <module>
    app = config.load_paste_app(conf)
  File "/usr/lib/python2.7/dist-packages/glance/common/config.py", line 196, in load_paste_app
    app = wsgi.paste_deploy_app(conf_file, app_name, conf)
  File "/usr/lib/python2.7/dist-packages/glance/common/wsgi.py", line 664, in paste_deploy_app
    return deploy.loadapp("config:%s" % paste_config_file, name=app_name)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 247, in loadapp
    return loadobj(APP, uri, name=name, **kw)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 272, in loadobj
    return context.create()
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 710, in create
    return self.object_type.invoke(self)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 203, in invoke
    app = context.app_context.create()
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 710, in create
    return self.object_type.invoke(self)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 144, in invoke
    **context.local_conf)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/util.py", line 56, in fix_call
    val = callable(*args, **kw)
  File "/usr/lib/python2.7/dist-packages/paste/urlmap.py", line 25, in urlmap_factory
    app = loader.get_app(app_name, global_conf=global_conf)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 350, in get_app
    name=name, global_conf=global_conf).create()
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 710, in create
    return self.object_type.invoke(self)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 146, in invoke
    return fix_call(context.object, context.global_conf, **context.local_conf)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/util.py", line 56, in fix_call
    val = callable(*args, **kw)
  File "/usr/lib/python2.7/dist-packages/glance/common/wsgi.py", line 589, in __call__
    factory = self._import_factory(local_conf)
  File "/usr/lib/python2.7/dist-packages/glance/common/wsgi.py", line 567, in _import_factory
    return utils.import_class(class_name)
  File "/usr/lib/python2.7/dist-packages/glance/common/utils.py", line 160, in import_class
    reason=e)
glance.common.exception.ImportFailure: Failed to import requested object/class: 'glance.api.v2.router.API'. Reason: No module named jsonschema

Installing python-jsonschema seems to fix the issue.