Augmented Reality (AR) application development is still lacking advanced authoring tools - even the simple presentation of information, which should not require any programming, is not systematically addressed by development tools. Moreover, there is also a severe lack of agreed techniques or best practices for the structuring of AR content. In this chapter we present APRIL, the Augmented Presentation and Interaction Language, an authoring platform for AR applications which provides concepts and techniques that are independent of specific applications or target hardware platforms, and should be suitable for raising the level of abstraction at which AR content creators can operate.
F. Ledermann, I. Barakonyi, D. Schmalstieg: "Abstraction and Implementation Strategies for Augmented Reality Authoring"; in: "Emerging Technologies of Augmented Reality: Interfaces and Design", IGI Global, 2007, ISBN: 9781599040660, 138 - 159.
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