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+Google has a limit of 50k lines / 10 MByte for text sitemap files, and 50K
+lines / 50 MByte for XML site map files.
+
+With a baseline of 100 million entities, that requires an index file pointing
+to at least 2000x individual sitemaps. 3 hex characters is 12 bits, or 4096
+options; seems like an ok granularity to start with.
+
+Should look in to what archive.org does to generate their sitemap.xml, seems
+simple, and comes in batches of exactly 50k.
+
+## Text Sitemaps
+
+Should be possible to create simple text-style sitemaps, one URL per line, and
+link to these from a sitemap index. This is appealing because the sitemaps can
+be generated very quickly from identifier SQL dump files, run through UNIX
+commands (eg, to split and turn into URLs). Some script to create an XML
+sitemap index to point at all the sitemaps would still be needed though.
+
+
+## Resources
+
+Google sitemap verifier: https://support.google.com/webmasters/answer/7451001