In other words, you want to ensure that an entity reference is resolved to a value you determine, rather than what is in the DTD.
换句话说，要确保实体引用解析为您决定的值，而不是DTD中的值。
The enable-call-by-reference element is generally used to pass parameters by reference rather than by value, which requires making a copy of the parameters.
enable-call-by-reference元素通常用于按引用传递参数，而不是按值传递，后者需要对参数做复制。
For reference types, the value is the reference rather than the contents of the reference.
对于引用类型，该值是引用而非该引用的内容。
For reference types, the value is the reference rather than the contents of the reference.
对于引用类型，该值是引用而非该引用的内容。
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