Last modified: 2014-11-12 13:58:20 UTC
An initial population of untity_usage could be done based on the item_per_site. However, we have to decide whether we should mark the linked items as being used wrt the "sitelinks" aspect only (they all are), or wrt the "all" aspect (which only a few actually are). determining the *correct* aspect requires re-parsing the pages.
removed "based on items_per_site" from description, since we'll probably use page_props instead.