For pdc_discovery, a blacklight application at Princeton to improve findability for open access data sets, we want to publish a sitemap so that search engine crawlers can more easily index our content. Orangelight, Princeton's library catalog, which is also a Blacklight application, uses an older system, blacklight-sitemap. However,
blacklight-sitemap hasn't been updated in awhile, and using rake tasks to re-generate very large sitemaps is less than ideal because it takes time and the sitemaps become stale quickly. Given these drawbacks to our existing approach, I was excited to try the more recent solution in use at Stanford and Penn State (among others): blacklight_dynamic_sitemap.
Jack Reed, one of the authors of this solution, has a good [blog post](https://www.jack