Object hirarchy

[trueg]

The situation is simple again:
Imagine a download for which we remember the source and referrer and dl time and so on using a dedicated resource (please discuss the actual ontology in ticket #4). Now once the file itself is deleted we would want this information to be deleted, too.

Of course we could add specialized handling for this case but IMHO a generic solution would be much nicer.

Such a solution would need a new property which would identify the download resource as a child resource to the file. The semantics would say that a child is useless without its parent. Thus, it needs to be deleted with the parent.

I see 2 approaches:

1. Change the semantics of nie:hasPart and nie:isPartOf
2. Add a new property pair

[trueg]

I just noticed that we already have nao:hasSubResource and nao:hasSuperResource. So this is actually already solved. I suppose Leo and I did this a while ago and I simply forgot.