如果您希望通过外部实体引用的文件不是XML文件，您必须在系统标识符之后指定该文件的格式，下面是一个使用PNG文件的例子。

If the file that you want to reference through an external entity is not an XML file, you must also specify the format of that file following the system identifier, as in this example for a PNG file.

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如果需要更多的控制，您可以为using修饰符明确指定格式字符串。

If you need more control, you can explicitly specify a format string for the using modifier.

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名称以统一资源标识符 (universal resource identifier，URI) 的格式定义，并在消息流中指定参数的位置。

The deployment parameters are specified as name/value pairs, where names are defined in the form of the universal resource identifier (URI), specifying the parameter's locations in the message flows.

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