Dependency vs Usage vs Association vs Connector

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Rule-of-thumb: If it is likely that a connection will always be made (in an Internal Block Diagram (IBD) or internal structure compartment in a BDD) between two part properties corresponding to two typed Block instances, consider creating a named Association between the two parts - rather than (just) using a Usage or Dependency relationship - and type a Connector by it:
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The anonymous Connector :UsbSource in the context block CarPlayingMusic has been typed by the named Association UsbSource.

BTW: The example here uses basic part-to-part connection (there are no ports involved yet).

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