What is SGML?

It's a standard generalized markup language.

Standard generalized markup language is an international standard language that defines the structure of electronic documents and describes their contents. Is an international standard on information management (ISO? 8879: 1986? Information processing). ISO/ANSI/ECMA standard, which is used to annotate text documents and provide document fragment type information. This standard defines the format, index and link information of text documents independent of platform and application, and provides users with a mechanism similar to grammar to define the structure of documents and tags representing the structure of documents. The meaning of "tag" refers to the tag inserted into the document.

Extended data

Language features:

Standard generalized markup language is a language that describes languages, and defines the method of representing texts in electronic form. It is characterized in that:

(1), formally, it can allow to verify the correctness of the document.

(2) Structured and able to handle complex documents.

(3) Extensible and able to support the management of large-scale information storage. ?

Baidu encyclopedia -SGML