directive @link(url: String, import: [Import]) repeatable on SCHEMA

The @link directive links definitions within the document to external schemas.

External schemas are identified by their url, which optionally ends with a name and version with the following format: {NAME}/v{MAJOR}.{MINOR}

By default, external types should be namespaced (prefixed with namespace__, e.g. key directive should be namespaced as federation__key) unless they are explicitly imported. graphql-kotlin automatically imports ALL federation directives to avoid the need for namespacing.