You reuse the redefine mechanism to avoid modifying the existing core schemas.
可以重用上述的重定义机制以避免修改现有的核心模式。
The any element is probably best utilized by the original core schemas to indicate where the original authors intended to have their schema extended.
any元素可能最好用于最初的核心模式，表明原始作者希望扩展该模式。
Redefines provide a powerful mechanism for defining extensions to existing schemas, but they also illustrate the importance of developing core schemas with extensibility in mind.
重定义为定义已有模式的扩展提供了一种强大的机制，同时也说明了开发具有可扩展性的模式的重要性。
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