[xwiki-users] Back-links for custom class instance properties? More general back-link functionality

Is there a way to get the back-links for properties of a custom class instances? The current backlinks infrastructure seems to work only over links of ordinary Documents. In particular, on line 1507 of com.xpn.xwiki.storeXWikiHibernateStore, in the saveLinks function of a recent SVN checkout it says: XWikiRenderer renderer = renderContext.getWiki().getRenderingEngine().getRenderer("wiki"); renderer.render(doc.getContent(), doc, doc, renderContext); links = (List) renderContext.get("links"); How can this be parameterized, so that links contained in property values of custom Class Instances are being included into the links variable? Example: Class Car: Instance Space1.car1 Property "carsThatAreFaster": values: "Space1.car2" where Space1.car2 is a link to another Car instance. The above saveLinks function does not update the BackLinks table with the Space1.car2 link. Any ideas are appreciated. Thanks, Andreas