I have a
schema that allows a bunch of different elements to be
interleaved in any order; one of them is
<collection>; I want to require that a collection
with value "all" be present, as well as allowing any
number of other collections, in any order, using RELAX --
is that possible?
No, it isn't. It would have to be element collection
{"all"} & element collection {text}, and it is
forbidden to have the same element name on both sides of
&. This is one of the few arbitrary restrictions in
RNG. Even that formulation, if it were legal, would allow
more than one "all" collection, since there is no way to
say "everything but 'all'" in RNG.
However, this is a perfect application for an embedded
Schematron rule asserting that count(collection[text() =
"all"] = 1. Jing supports embedded Schematron 1.5 rules
quite nicely.
