The "structured data with programmatic access methods" sounds a lot like microformats2 (https://microformats.org/wiki/microformats2 https://microformats.org/wik

The "structured data with programmatic access methods" sounds a lot like microformats2 (https://microformats.org/wiki/microformats2 https://microformats.org/wiki/microformats2), which is being used quite successfully in the IndieWeb community to drive machine interactions with human websites.