The unparsed-entity-url() function returns the URI of the unparsed entity with the given name. This is non-XML data referenced in the DTD of the source document.
string unparsed-entity-url(string)
The name of the unparsed entity. If the argument is not a string, it is converted using the rules of the string() function. The name should be an XML Name.
The URI of the unparsed entity retrieved from the DTD, if it exists. Otherwise an empty string.
Not supported.
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https://developer.mozilla.org/en-US/docs/Web/XPath/Functions/unparsed-entity-url