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。
基于6个网页-相关网页
contract-first 契约优先 ; 契约先行 ; 优先
first-best contract 最优合同
First Contract 第一份合同
After First Contract Duty 先合同责任
first grade contract maintenance 收获
first contract duty 先合同义务
first contract segment 第一合同段
first the contract duty 先合同义务
Have the other party sign the business contract first, then sign and send back an original.
让另一方先签合同，然后你再签并把一份原件送达对方存根。
William: I would convince everybody to do contract first approach and define a unique standard to describe service SLA.
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。
Finally a SAAJ client will be developed to access the Product Catalog web service developed in Part 1 using Axis2 with Contract First approach.
最后，将开发一个SAAJ客户端，用于访问第1部分中使用Axis2和契约优先方法开发的Product Catalog web服务。
In the nineteen forties, Lena Horne was the first African-American in Hollywood to sign a long-term contract with a major movie studio.
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Motown signed him to his first contract at the age of twelve.
VOA: special.2009.05.11
On July first,LeBron James' contract with Cleveland expired.
VOA: special.2010.08.06
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