Informally, XQuery is designed to be able to construct any XML document that can be computed from input XML documents using the power of the first-order predicate calculus.
XQuery被非正式地设计为可以构造XML文档，而这些XML文档是通过对输入的XML文档进行一阶谓词演算得出的。
This kind of assertion seems to require special language extensions and has led people to suggest introducing first-order predicate calculus.
这种情况下的断言似乎就需要实现特定的语言扩展，于是一些人建议引入一阶谓词演算。
Three temporal logics i. e. first-order predicate calculus, modal logic and reified logic are discussed.
讨论了三种时间逻辑方法：一阶谓词演算，模态逻辑及具体化逻辑。
Three temporal logics i. e. first-order predicate calculus, modal logic and reified logic are discussed.
讨论了三种时间逻辑方法：一阶谓词演算，模态逻辑及具体化逻辑。
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