void ModelComponent::updateFromXMLNode(SimTK::Xml::Element& aNode,
        int versionNumber) {

    if (versionNumber < XMLDocument::getLatestVersion()) {
        if (versionNumber < 30506) {
            // geometry list property removed. Everything that was in this list
            // should be moved to the components list property.
            SimTK::Xml::element_iterator geometry = aNode.element_begin("geometry");
            if (geometry != aNode.element_end()) {
                // We found a list property of geometry.
                SimTK::Xml::Element componentsNode;
                SimTK::Xml::element_iterator componentsIt = aNode.element_begin("components");
                if (componentsIt == aNode.element_end()) {
                    // This component does not yet have a list property of
                    // components, so we'll create one.
                    componentsNode = SimTK::Xml::Element("components");
                    aNode.insertNodeBefore(aNode.element_begin(), componentsNode);
                } else {
                    componentsNode = *componentsIt;
                }
                // Copy each node under <geometry> into <components>.
                for (auto geomIt = geometry->element_begin();
                        geomIt != geometry->element_end(); ++geomIt) {
                    componentsNode.appendNode(geomIt->clone());
                }
                // Now that we moved over the geometry, we can delete the
                // <geometry> element.
                aNode.eraseNode(geometry);
            }
        }
    }
    Super::updateFromXMLNode(aNode, versionNumber);
}