Convert the seven checkers the complexExtensionBaseValid compile rule
dispatches (the cos-ct-extends/src-ct content-derivation family) to located
findings so each error attaches to its derivation node instead of the schema
root (#169): a complexContent extension adding element content over a
simpleContent base, a simpleContent restriction whose base is a built-in or
user simple type, an unfaithful inline type in a simpleContent restriction, a
complexContent base that is a simple type, a simpleContent extension whose
base is xs:anyType, and a mismatched mixed setting on a complexContent
extension each underline their extension/restriction node; an element
carrying a default/fixed value over element-only or empty content underlines
the element.
Each predicate, iteration order, and reason string is unchanged; only the
location each finding carries differs. The seven checkers had exactly one
caller each (the dispatch), so each is renamed in place and the .unlocated
wrap dropped. To keep the file under the 400-line limit, the seven functions
and their two private helpers move to a new SchemaContentDerivation.swift;
the shared extensionAddsElementContent helper, still used by the all-group
checker that stays behind, becomes module-internal. Adds a located-
diagnostics test per checker.
Mihaela Mihaljevic
2b465e9c9c