keystone

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Therefore, XForms can become the keystone of a highly productive declarative and XML-centric development environment.
因此，XForms 可能成为高生产率的声明性的、以 XML 为中心的开发环境的基础。
The company promised reductions in rates of more than 20 percent, but after submitting our employees’ personal data, the rates turned out to be almost identical to what we were paying Keystone.
这个公司所承诺的是降低至少20%的费用，但是在提交每名员工的个人资料以后，结果相比于我们所支付的“凯斯通”费用基本相同。
Vogels (2003) claimed that the "XML document is the Web service's keystone because it contains all the application-specific information that a service consumer sends to the service for processing."
Vogels (2003) 声称 XML 文档是 Web 服务的基础，因为它包含服务客户发送给服务处理的所有特定于应用程序的信息。

Just as a keystone holds together a stone arch, Pennsylvania was seen as holding together the young American republic.
The proposed Keystone XL pipeline would carry heavier crude oil produced from tar sands in Canada.
Pennsylvania's nickname is the Keystone State.

Thor's back-office organization has helped Keystone boost its once-struggling quality and service operation and spare-parts distribution.
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(STONE) the middle stone in the top of an arch that has a special shape and holds all the other stones in position
(IMPORTANT PART) the most important part of a plan, idea, etc. on which everything else depends

A keystone of a policy, system, or process is an important part of it, which is the basis for later developments.
A keystone is a stone at the top of an arch, which keeps the other stones in place by its weight and position.