2d barcodes

There are various types of 2D barcodes, this page is used to list pros and cons of each and how they can be used to encode microformats and picoformats

• qr_code
• semacode

• a 2D barcode can be used to encode the URL of a hCard on a business card or letterhead
• a 2D barcode can be used to encode small amounts of machine-readable information, even in places without internet access -- perhaps warchalking-like geo information on how to find nearby internet access points?
• ... ?

Further reading

• Wikipedia: barcode#Matrix (2D) barcodes
• Wikipedia: object hyperlinking