可以命名的其它 XML 项，如处理指令目标和实体，不能拥有用名称空间限定的名称。
The other XML items that can be named, such as processing-instruction targets and entities, cannot have a name qualified with a namespace.
XML Catalogs 提供了 XML 处理程序应如何解析 XML 实体或 URL 请求的指令，并且允许您替换资源。
XML Catalogs provides instructions on how an XML processor resolves XML entity or URL requests, and it allows you to substitute one resource with another.
ML Catalogs 1.1 [oasis标准]定义了一种指令格式，用于XML处理程序应如何把XML实体标识符解析成实际的文档的指令。
ML Catalogs 1.1 [OASIS Standard] defines a format for instructions on how an XML processor resolves XML entity identifiers into actual documents.
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