Saxon

Using xs:override to override a schema document that imports or includes other schema documents is likely to result in spurious warnings such as

Warning: at /xs:schema/xs:override[10]

The model group definition info-types is ignored, because it does not override anything in

the target schema

This happens because the effect of xs:override propagates through the whole hierarchy of schema documents; the schema documents are transformed by replacing xs:include declarations by xs:override, and some of these generated xs:override declarations will have no effect.