unparsedEntityDecl
unparsedEntityDecl is an event generated by an XML or SGML parser when it encounters an unparsed entity declaration in the document's DTD. An unparsed entity is a resource, such as an image or a binary file, that the parser does not process as XML or SGML markup. Instead, the parser makes the entity's location and type available to the application, which can then fetch and process it independently.
When a parser encounters an unparsed entity declaration, it typically invokes a callback function or triggers
Applications use the unparsedEntityDecl event to manage external resources referenced within an XML or SGML document.