A non-self-referencing model group redefined inside xs:redefine must be a valid
restriction of the group it redefines (cos-group-restrict / src-redefine 6.1.2),
so its content model may not widen the original's language. The check reuses the
particle-restriction oracle used for complex-type restriction, resolves the
original group by namespaced identity with a {}name chameleon fallback, and runs
post-compile where element type compatibility is available.
Now rejected: adding required content to an empty base (schZ006), dropping a
required all member (schL1), reordering an all (schL5/L6, the Recurse rule is
order-preserving even for all), growing to a superset (schL8), and the
multi-document/chained redefines schN4/5/6/7 and schL10. To stay
false-positive-free the check skips a redefinition carrying a self-reference and
declines to judge a base with a maxOccurs=0 pointless particle (the contested
case W3C accepts, mgO013); genuine restrictions (dropping an optional member, an
unchanged redefinition) are accepted.
XSTS invalid-schemas-accepted 64 -> 51, no false positive (valid-schemas-rejected
and valid-instances-rejected held at 0; an over-rejection of mgO013 surfaced by
the gate was fixed before commit, and an adversarial critic confirmed FP-safety),
no other bucket moved. Disclosed under-rejections: self-referencing redefinitions
(schN10) and maxOccurs=0-base redefines.
Mihaela Mihaljevic
af5d7882b0