| Name | Kind | Description |
| label | artifact | |
| Label | class | |
| length | attribute | TODO: how to represent time intervals? |
| length | attribute | duration (span) of this timeline segment. |
| Link | class | |
| link | artifact | forwarding, adapting or connecting ProcNode |
| load Media | use case | |
| Lock | class | |
| Lock | class | |
| Logic | class | |
| longDesc | attribute | user visible qualification of the thing, unit or concept represented by this asset. perferably "in one line". To be localized. |