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OSA/Parlay is an important API specification for opening the door of service provision to 3rd party service providers. However, the application development directly based on OSA/Parlay APIs is very difficult because of the complexity of the specification. Software pattern and framework technologies can help building OSA/Parlay application frameworks to facilitate the application development. Then a pattern language is designed for building OSA/Parlay application frameworks. It should be pointed out that the pattern language is also suitable for the application frameworks based on other API specifications (e.g. JAIN APIs).