The relationshp between Domain Model (DM), Sequence Diagram (SD), and Domain Class Diagram (DCD).

The difference betwen DM and DCD:

1. DCD is code level. DM is business level.

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Detailed posts are here

Domain Model (DM):

Sequence Diagram (SD):

Domain Class Diagram (DCD):

Domain model drawing tool (when creating a project, select Class Diagram)

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Sequence Diagram

Sequence Diagram (SD) is the tool to turn Domain Model (DM) into Domain Class Model (DCM). Drawing tool.

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Domain Class Model

Relationship

1. A is dependent on B / B is independent on A

class A:
    myB = B()
    def doOne():
        myB.doTwo()
        myB.doThree()

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UML