return modelSource.getInputStream();
                }

                @Override
                public String getLocation() {
                    return modelSource.getLocation();
                }

                @Override
                public Source resolve(String relative) {
                    if (modelSource instanceof ModelSource2 ms) {

        @Override
        public InputStream getInputStream() throws IOException {
            return source.openStream();
        }

        @Override
        public String getLocation() {
            return source.getLocation();
        }

        @Override
        public ModelSource2 getRelatedSource(String relPath) {
            Source rel = source.resolve(relPath);