define Binding

[ichthyo]

A binding is a concept used within the session (and maybe beyond?), e.g. for

• linking a Sequence into a Timeline
• linking a Sequence into a meta-clip
• for the model root?

All these seem to encompass a flexible link and a mapping attached to this link.

Investigate the feasibility of using a common implementation here.

[ichthyo]

after analysing the situation regarding the Timeline-Sequence Binding, my conclusion is to make the model root a separate type for now. While there is indeed a structural similarity, currently I see no benefit in mapping this similarity into a type relation. This is an option for later refactorings.

• model root corresponds to the session
• Binding corresponds to the timeline(s)
• the top-level track(s) correspond to the sequence(s)

Session, timeline(s) and sequence(s) act as facade objects.

[ichthyo]

(In #311) This part of the design is still not completely settled, which is likely to become a blocker.

Note: the implementation can be safely delayed until Alpha or later