How to save a schema "library" in Tamino

Hello all,

Let’s say I create a library of abstract elements.
How would I save this library into tamino? It seems to me you need to define for which doctype the schema is for. But this “library” schema is for no doctype in particular, it’s to be used by other schemas.

How would one also reference this new schema in other schemas? With include or import? And what is the difference between these two (include, import).

I’ve read the docs on this, but it’s still unclear.

Thank you, Peter