According to schema.org, this is how you are supposed to mark up your html to make use of "rich snippet" metadata that is to be gobbled up by search engines:
<div itemscope itemtype="http://schema.org/Event">
But itemscope
on itself is invalid. It's a boolean value, not an attribute like itemscope="true"
I'm using PHPTAL and it refuses to process my page once it runs into this attribute. Other validators choke as well.
So is schema.org's specification just plain wrong?