Whats the difference between SGML & XML?
SGML (Standardized Generalized Markup Language), while not the first markup language, was the first of the three more talked about markup languages? (SGML, XML and HTML) coming into commercial use in the early 1990’s. It is the most robust implementation of the three, with many features that make it suitable for large-scale applications. It is still in wide use, primarily for legacy applications. The downside of SGML is that some of the features designed to handle the more arcane requirements make it unwieldy and more difficult to build software that can fully support it, with a corresponding lack of newer software to support it. XML (Extensible Markup Language) began as a simpler, more flexible subset of SGML that eliminated some of the more esoteric features that were causing the most difficulty in implementation. Removing these rarely-used features made it easier to develop tools to work with XML. The relative ease of implementation, coupled with the growing need of to support digit
