'Get one catalog of given name.
Parameters
name : str
Primary key identifying the catalog.
Returns
obj : `VOSCatalog`
Raises
MissingCatalog
If catalog is not found.'

def get_catalog(self, name):

    if (name not in self._catalogs):
        raise MissingCatalog(u"No    catalog    '{0}'    found.".format(name))
    return VOSCatalog(self._catalogs[name])
