Re: [xml-dev] [ANN] XSLT 1.0 and XPath 1.0 were published on 16 Nov 1999

XSLT 1 was spec'd by James Clark, of SP and SGML fame, based on his
former DSSSL (Scheme-based transformation and stylesheet language for
SGML) spec and his JADE implementation. You'll find lots of info on
the xml-dev list archives for 1997-99, and on the xsl-list archives
(https://www.biglist.com/lists/xsl-list/archives/).

Cheers,
Marcus Reichardt
sgmljs.net