@Override
        public int hashCode() {
            return Objects.hash(xml, artifact);
        }
    }

    private static class WrapModelSource implements ModelSource {
        private final org.apache.maven.model.building.ModelSource modelSource;

        WrapModelSource(org.apache.maven.model.building.ModelSource modelSource) {
            this.modelSource = modelSource;
        }

        @Override