Class of AdvancedRelationshipTypes for links to affiliate databases

This class defines relationships that allow MusicBrainz to interact with affiliate sites on the internet. Each record in the MusicBrainz database should be linked to the corresponding record in the other database. For example, Voices & Images can be purchased on Amazon, and the URL used should be the full URL: http://www.amazon.com/gp/product/B000005J5T. You shouldn't simply provide a link to http://www.amazon.com.

Note that the types in this class override the AdvancedRelationshipTypes in the other URL classes. So for example for Amazon being an affiliate use the type from this class and not MailOrderRelationshipType from GetMusicRelationshipClass.

AdvancedRelationshipTypes

Each affiliate database has its own relationship type. At the moment it is only one:

AmazonRelationshipType:
- album has amazon asin url
  - This provides a link between an album (a release) and the Amazon record for it. It is prefered over the AmazonMatching for cover images.