def METHOD_NAME(self, key, ver=None):
    """
        Retrieves a namespace from the dictionary with a specific version number
        Example:
        --------
        >>> from owslib.namespaces import Namespaces
        >>> ns = Namespaces()
        >>> ns.get_versioned_namespace('ows')
        'http://www.opengis.net/ows'
        >>> ns.get_versioned_namespace('ows','1.1.0')
        'http://www.opengis.net/ows/1.1'
    """
    if ver is None:
        return self.get_namespace(key)
    version = ''
    # Strip the decimals out of the passed in version
    for s in ver.split('.'):
        version += s
    key += version
    retval = None
    if key in self.namespace_dict:
        retval = self.namespace_dict[key]
    return retval