You can include other egw entries in a project, such as infologs, appointments, address book entries, etc., … Everything that could be relevant for a project.
These are then represented in the project by project elements, in the sense of a proxy.
The datastructure of an entry (infolog, appointment…) are different, the data in a project element are uniform in terms of the need for the project manager to be able to process and display them.
When adding, these different data structures are mapped to the uniform structure of the project element in the background.
The original entry is not changed by this, a project element can also be deleted again in a project, the original entry, the source, remains. An entry can also be added to several projects as a separate element.
A project element is, so to speak, an intermediate element; furthermore, the automatically adopted data of an entry in each element can also be changed or adapted individually.