Smart Microdata creates microdata for products based on schema.org and breadcrumbs based on data-vocabulary.org:



To check your markup, use the structured data testing tool:
http://www.google.com/webmasters/tools/richsnippets

Demo:
http://seopackpro.womgoo.com/

Test:
Structured Data Testing Tool

This extension is included in Opencart SEO PACK PRO. It contains 20+ SEO related extensions and you can save more than $150 by purchasing the full Opencart SEO PACK PRO:

http://www.opencart.com/index.php?route=extension/extension/info&extension_id=6182


*** This extension is not compatible with OC 2.x. The version for OC 2.x and OC 3.x is included in Opencart SEO Pack PRO which also includes all the other SEO related extensions and features.