NPG Publish States Ontology

"The PublishStates Ontology is a categorization of the various states that mark the publishing status of a publication. In particular, these indicate stages in the publishing workflow. For example, a siginificant state change for an online article publication occurs when it is bound to an issue publication, whereby it transitions from an earlier 'Advance online publication' state to an 'Issue publication' state. These state changes are managed by publish-event objects which capture both the publish-state and the date (or datetime) at which this event occurs."