对于Web服务，这些接口采用Web服务描述语言(Web Services Description Language，WSDL)来表达。 契约优先（contract first）的设计是一个有价值的SOA实践，或者换句话说，在考虑实现细节之前，先规定好参与的服务之间的消息格式和WSDL。
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首先，它完全专注于契约优先的Web Service设计。
Firstly, it's completely focussed on contract-first Web service design.
这个缺点可通过表述和强制某种设计和编码指南(如契约优先的开发)得到缓解。
This weakness can be mitigated by stating and enforcing certain design and coding guidelines such as contract-first development.
William：我会说服大家采用契约优先的方法并定义描述服务sla的唯一标准。
William: I would convince everybody to do contract first approach and define a unique standard to describe service SLA.
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