DOCBOOK-APPS: XSL versus DSSSL

given that i've concentrated exclusively on docbook and 
XSL stylesheets, am i correct in assuming that DSSSL stylesheets
are an alternative to XSL?  (which, AFAICT, i have no interest
in since i'm restricting myself to XSL).

  which leads to a related question -- as i read it, the jade
package works strictly with DSSSL, so i'm assuming i would have
little interest in that as well, unless jade handles XSL and it
just isn't documented that way.

hoping these questions aren't totally bone-headed,
rday