It would be cool if we could prevent relating no fitting url's from musik-sammler. Right now it is possible to relate an artist page from musik-sammler to a release or release-group on musicbrainz. it would be nice if we could prevent that in a way similar we do for discogs links (and allmusic to some extend). musik-sammler has their data ordered in a similar way musicbrainz does so 1:1 relations could/should be enforced.

here's a example on how their pages relate to mb entities:

artist page:
http://musicbrainz.org/artist/f0490061-7623-4cbe-b292-1b66d4f67d43
http://www.musik-sammler.de/artist/100743

can be identified by the "artist" part in the url

release-group:
http://musicbrainz.org/release-group/ab9e0a02-d5a7-4192-b2cd-bb9578039dfc
http://www.musik-sammler.de/album/364515

can be identified by the "album" part in the url

release:
http://musicbrainz.org/release/2decb88b-1616-403a-86c4-6b469ebedf7f
http://www.musik-sammler.de/media/594158

can be identified by the "media" part in the url