What is a sgml file and how do I open a sgml file?

The SGML file extension is a document file that is written in Standard Generalized Markup language, abbreviated as SGML. The file formats include tags that are used to describe the structure of the content and information that consists of various types of information that include graphics, video and audio data, and text and database information. Similar to XML file extensions, SGML files are being referenced as Document Type Definition or DTD files. These types of files describe the tags found within the document. Programs that open SGML file extensions include Adobe FrameMaker 10, Corel WordPerfect Office X6, JW and epcEdit.

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