Swignition (aka Cognition) is mostly a defunct project now. The code is being forked/rewritten as separate Perl distributions, including...

Input (X/HTML):

• HTML-Microformats
• RDF-RDFa-Parser
• HTML-HTML5-Outline
• XML-GRDDL

Input (Other):

• JSON-GRDDL and JSON-T
• HTTP-Link-Parser

Output:

• RDF-vCard
• RDF-iCalendar
• RDF-KML-Exporter
• XML-Atom-FromOWL