Chair for Computer Aided Medical Procedures & Augmented Reality
Lehrstuhl für Informatikanwendungen in der Medizin & Augmented Reality

D. Pustka, M. Huber, F. Echtler, P. Keitler
UTQL: The Ubiquitous Tracking Query Language v1.0
Technical Report TUM-I0718, Oct. 11, 2007. (bib)

Centrally coordinated Ubiquitous Tracking (Ubitrack) setups consist of a Ubitrack server and many clients. The server maintains a central Spatial Relationship Graph (SRG) that describes coordinate frames, trackers and trackable objects. Using Spatial Relationship Patterns, the server derives new spatial relationships from the SRG and generates data flow descriptions that are executed by the clients to satisfy their own or other client's queries. In this context, a language is needed for the communication between the clients and the server to exchange descriptions of trackers, tracked objects, tracked or otherwise known spatial relationships, client capabilities and data flow networks. This document describes the Ubiquitous Tracking Query Language (UTQL), an XML-based description and query language for Ubitrack system, that fulfils these requirements.
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