t20a.use

UML设计测试工具

model t20

class P1_A
end

class P1_B
end

class P2_A < P1_A
end

class P2_B < P1_B
end

association assoc2 between
  P1_A[*] role ra
  P1_B[*] role rb
end

association assoc1 between
  P2_A[*] role ra
  P2_B[*] role rb
end