DOCBOOK-APPS: Converting from DocBook/SGML to DocBook/XML

Hi,

What is involved in converting from DocBook/SGML to DocBook/XML? Just 
the header, or is there more serious work?

-- 
Richard Sharpe, , LPIC1
www.samba.org, www.ethereal.com, SAMS Teach Yourself Samba
in 24 Hours, Special Edition, Using Samba