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Web services are becoming increasingly popular for implementing business software systems, partly due to the flexibility offered as functionality can be dynamically changed or extended by adding or replacing services. A proposed approach to speed up service discovery is to group functionally similar web services into so-called communities. However, the state-of-the-art development protocol of web service communities lacks ability to accommodate web services which do not completely satisfy the expectations of the community. This paper explains why it may be useful to have a more flexible approach where new services may be allowed into a community even if they initially appear not to fully comply with the community's expectations. A policy based negotiation approach is proposed, allowing the community master service to automatically include new services in a flexible manner. The approach is supported by an implemented tool prototype and illustrated by an example.