DSSSL is actually not that dead. Postgres documentation was built with use of DSSSL until 2017. https://github.com/postgres/postgres/blob/REL9_6_STABLE/doc/src/

DSSSL is actually not that dead. Postgres documentation was built with use of DSSSL until 2017. https://github.com/postgres/postgres/blob/REL9_6_STABLE/doc/src/sgml/stylesheet.dsl https://github.com/postgres/postgres/blob/REL9_6_STABLE/doc/...