Wikipedia:UF

A Microformat (sometimes abbreviated μF or uF) is a way of adding simple semantic meaning to human-readable content which is otherwise, from a machine's point of view, just plain text. They allow data items such as events, contact details or locations, on HTML (or XHTML) web pages, to be meaningfully detected and the information in them to be extracted by software, and indexed, searched for, saved or cross-referenced, so that it can be reused or combined.

For example, 52.48,-1.89 is a pair of numbers which may refer to anything; but in some contexts could be understood to be a set of geographic coordinates. By wrapping them in spans (or other HTML elements) with specific class names (in this case part of the geo microformat specification):

... machines can be told exactly what each value represents, and can then index it, look it up on a map, export it to a GPS device, or whatever.

Other microformats allow the encoding and extraction of events, biographical/ contact information, social relationships, species names, product details, reviews, audio recordings, and so on. More are being developed.

Version 3 of the Firefox browser includes, and a future version of Internet Explorer may include, native support for microformats.

Page content marked up with microformats may be extracted using various browser plugins and parsers.

Use {{}} to show your participation in this project.

Put {{}} on the talk page of relevant articles.

Consider adding an hCard to your signature, like this:

If your user name has more than one word, and is not a given-name+surname pair, use class="fn nickname".

This wraps the displayed URL with class="url".

The following categories are not yet widely applied (see ), and so under-represent the numbers concerned:

The following may be of use.

Volunteers needed!

Geo (shortcut: WP:GEOUF) is for WGS84 coordinates (latitude;longitude).

...
Wikipedia