Definition and Usage
定义和用法

The unparsed-entity-uri() function returns the URI of an unparsed entity. The name of the entity must match the passed argument. If there is no such entity an empty string is returned.
unparsed-entity-uri() 函数的作用是：返回未解析实体的URI。实体名称必须与被传递的自变量相匹配。如果不存在该实体，那么将返回一个空字符串。

If the DTD contains the following declaration:
<!ENTITY pic SYSTEM "http://www.w3schools.com/picture.jpg" NDATA JPEG>
the following expression:
unparsed-entity-uri('pic')
will return the URI for the file "picture.jpg".

如果DTD包含了下列声明：
<!ENTITY pic SYSTEM "http://www.w3schools.com/picture.jpg" NDATA JPEG>，
那么下面的表达式：
unparsed-entity-uri('pic')
将返回"picture.jpg"文件的URI。

Syntax
语法

string unparsed-entity-uri(string)

Parameters
参数

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