Microformat design patterns are not themselves microformats; rather, they formalize commonly reused pieces of code that are generally useful in developing new microformats (and may also be useful in developing semantic HTML other than just in relation to microformats).
This appendix covers the design patterns you'll encounter most frequently in your work with microformats.
The abbr design pattern uses the
<abbr> (abbreviation) element of HTML to provide a mechanism for marking up both human-friendly and machine-readable values for the same element. This is important to meet the microformats principles of being "designed for humans first, machines second" and to "enable and encourage ...