Chudnov adds that libraries will need to follow “steady URL patterns” for as much of their resources as possible, one of the key rules of Linked Data. 52 He also notes that we will know we have made progress on the implementation of Linked Data when “link hubs at smaller libraries (aka catalogs and discovery systems) cross link between local holdings, authorities,these national authority files, and peer libraries that hold related items,” though the real breakthrough will come when “the big national hubs add reciprocal links back out to smaller hub sites.”53 Before this can happen, however, libraries must make sure that all of their own holdings link to each other, from the catalog to items in online exhibits. Chudnov also advocates adding user-‐generated knowledge into the mix by allowing users to make new connections between resources when and where they can. 54