Service Locator 模式对封装使用 JNDI 的代码仍然有用，即使定位器不使用缓存。

The Service Locator pattern is still useful for encapsulating the code that uses JNDI, even if the locator does not use caching.

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代理设计模式也可添加缓存和一些内容验证，因此在所有内容均加载自同一服务器时，这是一种不错的解决方案。

The proxy design pattern also has possibilities for adding caching and some content validation, making it a good solution even when all content is loaded from the same server.

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如果确认解析器没有对模式定义进行高速缓存，这种请求的开销会使系统失去可扩展性。

The overhead of this request can make a system unscalable if the validating parser does not cache the schema definitions.

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