public static List<ModelReference> toModelReferences(List<ModelNode> modelNodes) {
        List<ModelReference> modelReferences = new ArrayList<>();
        for (ModelNode modelNode : modelNodes)
            modelReferences.add(modelNode.getModelReference());
        return modelReferences;
    }
Represents a 'model' in a {@link ConfigInstance}.

@author bratseth
config-lib/src/main/java/com/yahoo/config/ModelNode.java