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Units can be published. Once published, units are available for reuse.
The same publishing rules apply to units as components; units are available for reuse in courses once they are published (see: https://github.com/openedx/frontend-app-authoring/issues/1353 )
Units can be tagged
Units can be copied
Units can be pasted
Units can be added to, and removed from, collections
Collections can contain a mix of both components and units
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View-only and Edit modes/Managed vs externally managed vs unmanaged [we need to clarify what the expected behaviors, permissions etc are for each of these?]
Requirements TBD
Managed content item - any level of content (section, subsection, unit, component) that exists in a library.
Externally managed content item - any level of content that exists in a library that is ‘connected’ to an external CMS.
Unmanaged content item - any course content not from a library
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