Which is used to define descriptions of the structure of different types of an electronic documents?
The Standard Generalized Markup Language (SGML; ISO 8879:1986) is a standard for defining generalized markup languages for documents. SGML can be used for publishing in its broadest definition - from single medium conventional publishing on paper to on-line multi-media database publishing. SGML can be used to produce files that can be read by people and exchanged between machines and applications in a straightforward manner. SGML is used for marking up documents and has the advantage of not being dependent on a specific application. It is derived from GML (generalized markup language), which allowed users to work on standardized formatting styles for electronic documents.
What are rules for well formed XML document?
Which one describes how to display an XML document for a given type?
Which are used to avoid element name conflicts in XML?
Pick out the Basic rule while writing XML?