I think DocBook does not have presentational markup. Not more than XHTML does. There are tags <emphasis> and <emphasis role="strong">, but that's just as much as <em> and <strong> in XHTML. 62.176.30.2 19:02, 26 Apr 2005 (UTC)
*roff as a markup language
What about roff, troff, nroff, groff, etc.? Where do they fit in in this scheme?