When using
The document that you link to contains the following example:
In the following example, one entry ("Authors") is linked to two values ("John" and "Luke").
- Authors
- John
- Luke
- Editor
- Frank
In other words, the two elements following a single element are both associated to that same element.
There doesn't appear to be much of a difference in terms of semantics, then, between having multiple successive elements, and having a single that in turn contains a . If it's important to distinguish "a list" (a in a single ) from "a group of values" (multiple s in sequence), then I would decide based on that. If that's not important, then given a choice I would pick multiple s in sequence, because it is simpler.