Particle Valid (Restriction) derives its pairwise check over the spec's
normalized content model: pointless particles are eliminated (maxOccurs=0
members dropped, a {1,1} single-member group unwrapped, a nested
same-compositor {1,1} group spliced), all language-preserving. The outer
occurrence-range check was wrongly applied to the cross-kind pairings, where
it compares a derived particle's own range against a base group's or
wildcard's. It is now applied only to the same-kind pairings (element/element,
wildcard/wildcard, group/group) and element/wildcard; element/group
(RecurseAsIfGroup), group/element, and group/wildcard match occurrence inside
the case, against a member or as an effective total range.
A group restricting a wildcard (NSRecurseCheckCardinality) is valid when every
leaf is admitted and the effective total occurrence range is within the
wildcard's; a group restricting a single element is bounded the same way, by
that element's name, type derivation, and occurrence range.
XSTS: valid schemas rejected 45 to 32, invalid schemas accepted 528 to 526,
no other bucket raised.
