jcoffey-dev is traveling from Thursday 1 October through Sunday 4 October. Issues and pull requests are welcome, and will get an answer after that. Thanks for your patience.
Schema layout entries for the console pages of the DLP and mail flow rules spec (§3): Held Mail and Data Loss Prevention under Management > Compliance after Legal Holds, and Mail Flow Rules beside the server Sieve scripts (the console's nine-group Settings bar places it under Mail flow). An older console shows these as unknown pages, so this ships with the console that has them.