Despite its bad image, JavaScript is an elegant, lightweight, and highly expressive language. With HTML5 implementations are becoming more widespread, almost all major browsers for the desktop or mobile devices offer advanced features like a canvas or local storage. Especially mobile Web browsers are becoming more advanced, and mobile devices provide more memory capacity, HTML5 capabilities and faster JavaScript implementations. This allows developers to easily create Topic Maps applications based on the JavaScript Topic Maps Engine tmjs.

As a demo, we have created the prototype of a simple, generic topic map viewer for the iPhone. The viewer can read JTM topic maps and provides the user with different ways to find and access relevant subjects.

Additionally, the application tries to introduce a different way of viewing topic maps as other generic viewers such as the Omnigator or Maiana. It takes the focus away from association types, role types, name types and occurrence types and concentrates on topic types and on giving the user quick access to the subjects of the topic map.

In its current version, tmjs lacks some of the features required to implement permanent local storage of topic maps, so the current implementation relies on memory storage only.