<asset> with multiple authors

We are improving the schema constraints on the <asset> element for COLLADA 1.4.0. Currently the child elements are unordered and unbounded. There are two things we are considering:
[li] Changing the choice to a sequence. This has the effect of enforcing constraints like one <unit> element per <asset> etc. at the cost of ordering the elements in a particular way.[/:m:1mmaqjjt][/li][li] Changing the choice to a set (all). This does not impose an ordering, but it does limit the occurences to one of each child element. If you have only ever used one of each child then this is backward compatible with your use case.[/:m:1mmaqjjt][/ol]
If you have been using the <asset> element in your content please answer the poll question.