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Modern telecommunication networks and classical roles of operators are subject to fundamental change. Many network operators are currently seeking for new sources to generate revenue by exposing network capabilities to 3rd party service providers.At the same time we can observe that applications on the World Wide Web (WWW) are becoming more mature in terms of the definition of APIs that are offered towards other services. The combinations of those services are commonly referred to as Web 2.0 mash-ups.This report describes our approach to prototype a policy-based service broker function for Next Generation Networks (NGN)-based telecommunications service delivery platforms to provide flexible service exposure anchor points for service integration into so called mash-ups. The defined exposure API uses Intent-based request constructs to allow a description of services in business terms, i.e. intentions and strategies to achieve them and to organize their publication, search and composition on the basis of these descriptions.