A variable declaration, unless you assign a value to the variable.

变量声明，除非你给变量赋予了一个值。

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Template filters allow you to substitute that variable declaration with an actual value that you establish at runtime.

模板过滤器允许您用在运行时建立的实际的值代替变量声明。

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The default version is 1.0, unless some other value is specified in the document's XML declaration.

默认的版本是 1.0，除非在文档的 XML 声明中指定了其他值。

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