Attempt to restore the schema changes from PR 124 #172
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The schema changes from PR #124 were accidentally lost. This PR applies a slightly different set of changes to achieve the same purpose.
Now that we allow p;variable in between steps, I think it's a mistake to allow it inside p:choose as a sibling of p:when/p:otherwise. A user can simply put it before the choose if they want it to be available to all of the conditional branches.
I chose a slightly different content model that makes it clear that at least one of p:when or p:otherwise is required.
Hopefully this is seen as a friendly amendment to the original PR.