2445 SGML/XML Entity File Text (Mark-up) SGML/XML entity files are plain text files, often found alongside, and referenced by, xml and sgml files. Ent files list the parameters and entity declarations for a specific set of tags defined in a Document Type Definition. 234 National Library of Australia / National Library of Australia 03 Feb 2022 11/2023 (v.115)- internal signature removed for extension only identification. Submitted by Preservica. 15 Nov 2023 application/xml-external-parsed-entity MIME fmt/1618 PUID ent File extension