Functionality Implementation
| Functionality |
| The `unparsed-entity-uri()` function gives access to declarations of unparsed entities in the DTD of the source document. If the DTD contains the declaration:
        <!ENTITY mom-picture SYSTEM "http://www.home.com/mom.jpg" NDATA JPEG>
the expression `unparsed-entity-uri('mom-picture')` returns an URI for the file `mom.jpg`.
| Implementation |
| Unparsed entities must be gathered from the XML input document at the time when the DOM is built. To achieve this our parser must parse the document DTD (if any) and store all data of type NDATA (not XML data) in a hashtable in the AbstractTranslet object. All the compiled code for this function needs to do is call a method in the translet for retrieving the value for the requested element:
        public String AbstractTranslet.getUnparsedEntity(String entityName);
The translet will use the supplied `entityName` to look up the value in the hashtable and then leave the string value on the stack for the element that called `lang()`.

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