This document proposes a computational model to represent and analyze transmedia ecosystems. It begins by defining transmedia as story-based contents that expand narratives across multiple media.
It then reviews existing definitions and taxonomies of transmedia, which primarily focus on media expansions. The proposed model instead focuses on expansions of narrative worlds.
The document introduces a taxonomy with eight categories for classifying narrative expansion methods: spin off, reboot, prequel, sequel, interquel, midquel, sidequel, and paraquel. It illustrates the taxonomy using examples from the Star Wars transmedia ecosystem.