silverstripe-framework/docs/en/reference/versioned.md

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# Versioned
The Versioned class is a `[api:DataObject]` that adds versioning and staging capabilities to the objects.
## Trapping the publication event
Sometimes, you'll want to do something whenever a particular kind of page is published. This example sends an email
whenever a blog entry has been published.
:::php
class Page extends SiteTree {
// ...
function onAfterPublish() {
mail("sam@silverstripe.com", "Blog published", "The blog has been published");
parent::onAfterPublish();
}
}