swh.xsd: Improve readability
This also moves the inner element definitions of swh:reference to root elements, so they can be reused by new definitions in the future.
Migrated from D4600 (view on Phabricator)
Staging instance, all changes can be removed at any time
This also moves the inner element definitions of swh:reference to root elements, so they can be reused by new definitions in the future.
Migrated from D4600 (view on Phabricator)