Download Choosing a Metadata Type

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16. Right-click on the subject element and choose “Unbounded” from the context
menu. This means that there can be multiple (from one to infinity) instances of
the subject element underneath a book element.
17. The subject element will now appear with 1..∞ beneath it.
18. The current meaning of the choice element is “choose one of the child elements.”
We want the book element to contain multiple elements. In order to add this
functionality, right click on the choice element symbol, and choose “Unbounded”
from the context menu.
19. The choice element will be marked with 1..∞, indicating that one to infinite child
elements can exist beneath the book element.