Search giants unveil semantic vocab


Is a step forward for microdata or an attack on open standards?

Google, Yahoo and Bing have jointly unveiled a new vocabulary for the web that provides a standardised way to markup content so that it can be interpreted by search engines.

Sites that use will get preferential treatment in the search results.

Unsurprisingly, this has tread on a few toes because the open standards community has been working on open semantic markup standards for years, and was not consulted about this. The main complaint is that this move enables the search giants to control the markup that's used on the web, instead of allowing people to choose what works best for them.

Goodbye microformats? makes use of microdata, but not microformats or RDFa — both popular open standards for marking up content. One of the most prominent uses of microformats to date is Google's Rich Snippets, which display extra information in search listings such as the average star rating that a restaurant has received.

We're told at this stage that support for microformats and RDFa isn't being dropped, but it's likely that a switch to microdata will be required if a site is to remain competitive in the listings.

Dev backlash

Open standards guru Tantek Celik is strongly against the move. " is essentially an attempt by Google and Microsoft to dictate how we should add more meaning to the HTML that is published on the web," he told us.

"It's a subversion of every open standards community and process that has been working on this for years. It's also an undercutting of efforts by numerous individuals at both companies that already work openly in various open standards communities to develop such standards.

"It's probably the worst thing we've seen happen in the world of open standards development since the 1990s."

Google response

In response, a Google spokesperson told us: "Currently, there are many standards and schemas for marking up different types of information on web pages. As a result, it’s difficult for webmasters to decide on the most relevant and supported markup standards to use.

“Creating a schema supported by all the major search engines makes it easier for webmasters to add markup, which makes it easier for search engines to create rich search features for users."

Manu Sporny of the World Wide Web Consortium summarises the situation at, and you can read a transcript of a heated discussion between various interested parties at

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