Semantic invocation of Web services will focus on the standardization of service request and response to simplify the programming routine and make the invocation machine readable and understandable.
Web服务的语义调用主要关注服务请求和响应的标准化，以此来简化编程步骤，使得Web服务调用机制可读，容易理解。
Part 1 of this series provided a brief introduction to the SCA programming model and its evolution through standardization.
本系列文章的第1部分简要介绍了SCA编程模型及其标准化演化。
The formal semantics of programming languages can provide concise and precise language definition. It helps people not only to understand well the language, but also to standardization of language.
程序语言的形式化语义提供简洁而精确的语言定义，不仅帮助人们很好的理解语言，而且有助于语言的标准化。
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