If an explicit context is specified through the context attribute, then the absolute (local) URL is resolved against the named servlet context.
如果通过contex t属性显式地指定了上下文，那么就根据指定的servlet上下文解析绝对(本地)url。
An explicit context name can be provided using the context attribute.
可以使用contex t属性提供显式的上下文名称。
An explicit version element or attribute is included in the XML documents.
在XML文档中包含明确的version元素或属性。
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