Tells the parser how to deal with a specific binary file type, as well as provides a name and an external identifier for a notation. 通知分析器如何处理特定的二进制文件类型,并提供表示法的名称和外部标识符(EI)。
Key : key ( make sure that you mark the key as the external identifier ) Key:key(确定您已经将键值标记为外部性标识符)
For example, a user can change the parameter separator or external request identifier in the URL_Mapping_File. 例如,用户可以在URLMappingFile中更改参数分隔符或外部请求标识符。
GetState : This method finds an external object with an identifier defined as a uri URI object and gets the object's values whose corresponding keys are specified in propertyNames. getState:该方法会找到一个外部性对象,该对象的标示符会定义为一个uriURI对象,并得到对象的值,其相应的密钥在propertyNames中指定。
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 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