As an example — here is a link to a photo from years ago (2006) http://imgsnp.co/zaxra - made by Pat Hayes…of me listening to TimBl describe FOAF to Tom Gruber. As I recall — as I recall, TimBl - you said I could stand there for Pat to make my photo if I had a FOAF ID. I don’t think you expected I would say yes 
— but I did! LOL ----
when you click on the link to see the photo, you can click on the photo to flip it and show the metadata - including a link to view the triples (soon to be live linked); view the source of this file to see the RDFa.