representative-h-card-parsing

Assuming you already have access to a microformats2 parser, the algorithm defined here allows you to determine the representative h-card for a given page.

This algorithm is the microformats2 update to representative-hcard-parsing.

Algorithm

After parsing the page:

• If the page contains an h-card with uid and url properties both matching the page URL, the first such h-card is the representative h-card
• If no representative h-card was found, if the page contains an h-card with a url property value which also has a rel=me relation (i.e. matches a URL in parse_results.rels.me), the first such h-card is the representative h-card
• If no representative h-card was found, if the page contains one single h-card, and the h-card has a url property matching the page URL, that h-card is the representative h-card
• If no representative h-card was found, the page has no representative h-card

Matching URLs

URLs are to be matched as per the parsing algorithm defined in https://url.spec.whatwg.org:

• Parse the URLs
• If every component matches, the URLs match

Implementations

Open source implementations of the representative h-card algorithm.

• PHP barnabywalters/mf-cleaner package implements representative h-card parsing in getRepresentativeHCard() function
  • Example usage: $hcard = BarnabyWalters\Mf2\getRepresentativeHCard($mfs, $url);
• PHP indieweb/representative-h-card-php
• Add yours here!
• …

Back compat

All backcompat for representative h-card parsing should already be handled by the h-card backcompat rules, implemented by a conforming parser.

See Also

• h-card
• representative-hcard — original hCard work, most of which applies equally to the updated algorithm