Thank you so much for this extension! Not only is it useful for creating markup, but it also allows for the insertion of markup already written- which up until now was a huge problem in Joomla, as it was stripped immediately upon save regardless of settings. I encourage ALL webmasters to purchase this extension, as schema.org markup is here to stay and is an essential SEO tool. I have seen a dramatic result in control over search engine results using schema markup. GET THIS!