The serialization schemas define that the next fields can be aliased. * https://github.com/nemtech/catbuffer/blob/master/schemas/metadata/mosaic_metadata.cats#L12 * https://github.com/nemtech/catbuffer/blob/master/schemas/restriction_mosaic/mosaic_address_restriction.cats#L6 * https://github.com/nemtech/catbuffer/blob/master/schemas/restriction_mosaic/mosaic_global_restriction.cats#L7-10 The NEM2-SDK should accept ``NamespaceId`` for these fields as well as the current ``MosaicId`` type.