(See the sections on CSS and XSL below for more on formatting XML.) Separation of content and presentation is a key concept inherited from SGML. A lot of the programming is already done for you ...

Standard Generalized Markup Language (SGML) is a way of expressing data in text-processing applications. It's been around for more than a decade; both XML and HTML are document formats derived ...

The Root Cause of the Problem The ampersand character has special meaning in SGML, HTML, and XML markup languages. If you wish to use it literally, you must “escape” it.

Whereas HTML uses a fixed set of tags or codes to describe pages, XML maintains the flexible meta-language characteristics of SGML by defining the codes that will be used in each document.

Scholarly Digital Editions has released Anastasia, their next generation XML electronic publication system. Anastasia — which stands for Analytic System Tools and SGML/XML integration ...

Unlike SGML, the XML DTD was always optional, because the framers of XML knew there was enormous value in documents that were merely well-formed, even if not valid with respect to a DTD.