Datascheme

This is only a draft. Changes to this are welcome.

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To open this UML diagram in Eclipse you need to install the Papyrus Plugin.

There exists additional generalization-relations that are not shown in this diagram for readability. They are as following:

Class / baseClass	Entity	AccessibleEntity	NamedEntity
Band			X
City			X
Disc	X
Event			X
ExtLink	X
Gallery		X
Genre			X
Image		X
Instrument			X
LongLatPosition	X
Musician			X
Person			X
PlzPosition	X
Post		X
Record			X
Tour			X
Track			X
Venue			X

Interfaces

Not all Entities implement all Interfaces. Here is a list about which implement which, those not listed implement none:

Entity / Interface	Likeable	Commentable	Linkable	Authorable	Positionable	ExtLinkable	Hostable
Band	X	X	X	X		X
City	X	X	X		X		X
Event	X	X		X	X	X
Genre	X	X
Instrument	X	X	X
Musician	X	X	X	X	X	X
Person	X	X	X	X	X	X
Post	X	X			X	X
Record	X	X	X			X
Track	X	X	X			X
Tour	X	X	X	X		X
Venue	X	X	X	X	X	X	X

Semantic meaning of like

Liking an entity implies receiving newsstream updates for that entity. Additionally a like may mean different things depending on the type of the entity liked:

• Band: I am a fan of this band
• City: I live in this city
• Event: /
• Genre: /
• Instrument: I play this instrument
• Musician: I am a fan of this musician
• Person: I want to follow this person
• Post: /
• Record: I own this record
• Track: /
• Tour: /
• Venue: /

Open Questions

• Are Cities linkable or do we store image/city relations in the position field of images.