Default:  none

    Designates the Known Namespace whose name is given as the default
    namespace for this clerk.  A namespace-ident must be supplied using
    either the name or the nscts; there is no default:

    name    The name of the namespace. The name argument may
            be different from the nickname if the nickname is
            ambiguous.

    nscts   The value of the namespace creation timestamp
            (NSCTS) assigned to the specified namespace when
            it was created. The format is 14 pairs of hex
            digits (xx-xx).