@Override
    public Collection<ConfigModelBuilder> resolve(ConfigModelId id) {
        Set<ConfigModelBuilder> builders = new HashSet<>(chained().resolve(id));
        for (ConfigModelBuilder builder : builderList) {
            if (builder.handlesElements().contains(id))
                builders.add(builder);
        }
        return builders;
    }
Creates a bundled model class registry which forwards unresolved requests to the argument instance
config-model/src/main/java/com/yahoo/vespa/model/VespaConfigModelRegistry.java