kubernetes/staging/src/k8s.io/apiserver/pkg/cel/openapi/resolver/combined.go

// Combine combines the DefinitionsSchemaResolver with a secondary schema resolver.
// The resulting schema resolver uses the DefinitionsSchemaResolver for a GVK that DefinitionsSchemaResolver knows,
// and the secondary otherwise.
func (d *DefinitionsSchemaResolver) Combine(secondary SchemaResolver) SchemaResolver { … }

type combinedSchemaResolver …

// ResolveSchema takes a GroupVersionKind (GVK) and returns the OpenAPI schema
// identified by the GVK.
// If the DefinitionsSchemaResolver knows the gvk, the DefinitionsSchemaResolver handles the resolution,
// otherwise, the secondary does.
func (r *combinedSchemaResolver) ResolveSchema(gvk schema.GroupVersionKind) (*spec.Schema, error) { … }