問題文
A module holds two containers of the same shape. One of them turns a feature on merely by being in the tree. The other one only gathers a set of leafs under one name. An engineer has to say how the modeling language tells the two apart and what a server may do with the second one after its last leaf is taken away. Which statement is correct?
選択肢
- A statement that fixes whether a container is configuration marks the first one and a server drops a container of either kind as soon as its last leaf is taken away.
- A statement that gives a meaning to the existence of a container marks the first one and the server keeps the second one in the tree even after its last leaf is taken away.
- The first one is told apart by a statement that declares what its existence means and a server may drop the second one once the last leaf under it is gone.
- A leaf that is declared mandatory inside a container marks the first one and an empty container of either kind is reported as an empty element.