这一系列关于XML设计的文章中，以前曾经讨论了在元素和属性间做出选择的一般原则。

Earlier in this series on XML design, I discussed principles for choosing between elements and attributes.

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代码审计、加密的广泛应用和谨慎的配置选择等设计原则共同确保了OpenBSD的“默认即安全”原则仍然有效。

Design principles, such as code auditing, extensive use of encryption, and careful configuration choices, combine to ensure that OpenBSD's secure-by-default philosophy holds true.

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比较了电子式和机械式压力控制器各自的优缺点，并提出了选择设计方案的原则。

Merits and demerits between electronic and mechanical controllers are compared, and principle of selecting design scheme is presented.

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