in progress

A simple flextag would be a tweet that makes a claim about some web content, while providing a link:

The #flextag hashtag is optional, but can be useful to help people and machines correctly see what kind of tweet this is.

Flextags can also include parameters:

The square brackets indicate a portion of the flextag that is expected to vary depending on which item was tagged (linked), while still using the same flextag template to indicate the same general class of item.

The tagged entity does not need to be web content. It could instead be anything identified by the web content, as long as the phrasing of the tag makes this clear. For example:

The URL at the end of the flextag is optional, so flextags can we used to make statements about things without web pages, too.

Links can be used in the body of the flextag, but this can get confusing, and current best practice is to only do this when there is no subject URL, since the first URL in content is often extracted and given prominence, so it can easily be misunderstood as the subject.