In order to display Rich Snippets Google first need to find content in one of several specific markup formats (microformats, microdata and RDFa). Information can be actually be structured quite easily and added to most Web pages quickly. In some cases, it is as simple as wrapping the existing data on your pages with a few additional tags. Below you will find some general explanation of each of the markup formats and some sample code below. While we've only shown one markup format for each type of snippet you should be able to get a good idea of the subtle differences between the formats. Website Magazine's recommendation is to use the HTML5 microdata specification but the other formats are perfectly acceptable to use on your Web property.
Microdata Markup Format for People
The HTML5 microdata specification is a simple way to label content that describes a specific type of information-for example, information related to people. Each information contact type can have different properties including title, address, photo, name, etc.. Microdata uses simple attributes in HTML tags (often < span > or < div >) to assign the information to items and properties. Below is an example of the microdata markup format for people:
< span > or < div >) to assign information to entities and their properties. Below is an example of the microformat markup format for an (imaginary) event.
< span > or < div >) to assign information to entities and properties. Below is an example of the RDFa markup format for a review: