Thanks for your reply
By microformat, I am referring to the 'structured data' appearing inside HTML
pages (client code, not server/scripting code). For example from
"www.overstock.com" website i am interested in pulling all HTML pages having
<http://opengraphprotocol.org/schema> this schema used in providing structured
content in html document. This url
[http://www.overstock.com/Clothing-Shoes/DKNY-Womens-Down-Jacket/4231630/product.html]
page' code has used this schema. 

reg
jamshaid