pageoneresults - 6:05 pm on Mar 1, 2010 (gmt 0)
If Google wants to do this properly, they should at least introduce a generic class prefix for those class names, e.g. "Product Microformat Class Name", pr "pMCN_" so that:
Remember, this is not a Google initiative although they are probably one of the more aggressive users of the protocol.
In reference to the above statement, you use what is referred to as a Root Class Name...
Microformats - hCard parsing
Each compound microformat starts with a root element with a relatively unique class name. By that I mean a class name which isn't simply a common word, and is unlikely to have been used outside the context of the microformat.
Root Class Name Examples: vCard (the Root Class Name of hCard is vCard), hProduct, hReview, hCalendar
More information on the Class Design Pattern...
Microformats - class-design-pattern
Use the class-design-pattern to indicate semantic meaning about XHTML elements. Always use the most appropriately semantic (X)HTML element for the content. If an appropriate semantic element is not available, use <span> or <div>. Always avoid presentational (X)HTML. Add semantics to (X)HTML by using semantic-class-names. The class attribute is a space separated list of class names. Always choose names following the microformats naming principles.