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A declarative approach to a user-centric markup language for location-based services
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Location Based Services can be considered as the most rapidly expanding field of the mobile communications sector. The proliferation of the mobile/wireless Internet, the constantly increasing use of handheld, mobile devices and positioning technologies and the emergence of mobile computing, prepared the grounds for the introduction of this new type of services with impressively large application domain and use range. The combination of position fixing mechanisms with location-dependent, georgraphical information, can offer truly customized personal communication services through the mobile phone or other type of devices. Web Services have emerged as a set of open standards and gained a lot of momentum during the recent past. Many software vendors are announcing Web Service initiatives and adoption in their products. Many organizations are involved in the refinement of Web Service standards. Moreover, XML has become the de facto standard for data interchange on the Web and its emergence is having an enormous impact on Web development. Motivated by the technology advances in the aforementioned areas in this paper we discuss the exploitation of Web Services and XML to build a generic platform for delivering Location Based Services (LBS) to the nomadic user.