NSGMLS (N? Standard Generalised Markup Language S?)
The NSGMLS program is the SGML (Standard Generalised Markup Language)
parser that sits behind the W3C (World Wide Web Consortium)
and Web Design Group’s online validators. To save time online,
can be installed on a Windows workstation to edit CSS (Cascading Style Sheets),
HTM, XHTML (extensible Hypertext Markup Language) or XML (extensible Markup Language).
It comes bundled with James Clark’s SP package. It is
intgerated with HTMLValidator.