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Web Services appear promising to facilitate interoperability and enable Dynamic Value Webs - the on-demand aggregation of services even across enterprise boundaries. However, past experiences have shown interoperability limitations in practice mainly due to information asymmetries on the Web Services markets. This Paper describes a service-oriented architecture for building Dynamic Value Webs in mobile environments using adaptive Location-Based Services. Our concept addresses the following three predominant difficulties: (1) service adaptivity to changing conditions in mobile environments, (2) interoperability including higher levels of semantics, and (3) assuring trustworthiness to all affected parties.