Schema.org has [its faults][1], but at least there is now a fairly significant standard for expressing metadata within HTML. As Bing & Google are behind it, there will be adoption. HTML5 has a large number of new attributes that are quite semantically rich. However, tools built for an earlier era don't know about them. - Developers would like to know that their content is being expressed well. - Data wranglers would like to pull structured data from pages. To support this, we could build a validation and/or a scraper that knows what to do with this content. [1]: http://lists.freebase.com/pipermail/freebase-discuss/2011-June/006621.html--

Schema.org has [its faults][1], but at least there is now a fairly significant standard for expressing metadata within HTML. As Bing & Google are behind it, there will be adoption. - Developers would like to know that their content is being expressed well. - Data wranglers would like to pull structured data from pages. To support this, we could build a validation and/or a scraper that knows what to do with this content. [1]: http://lists.freebase.com/pipermail/freebase-discuss/2011-June/006621.html--