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Many companies and governmental organizations are looking towards Web services, play an important key role in implementing service oriented architecture (SOA) as a platform that support a wide range of demanding applications. But current Web services standards have many critical limitations: performance degradation due to network latency and limited network bandwidth, vulnerability from security attacks, availability problem (in terms of service continuity) cause of faults at Web services, applications or network partition, weak reliability due to messages loss and duplicated messages, etc. To solve this problem, it is required to define and extend an abstract model of service and the service quality attributes that handle all service related tasks, especially in discovery, selection and substitution of services. In this paper, we propose an XML schema for Web service quality management to support Web service based applications.