Result tree fragment to string?

I have a variable that contains a result tree fragment of HTML code.  I
need to convert the result tree fragment to a string.  The string must
not only include the text node values but the HTML element names and
attributes as well.

My development environment is constricting.  I must use XSLT 1.0; I
cannot use 1.1 or 2.0.  Further, I cannot use any type of extension
functions (such as xt:node-set() or EXSLT or xalan:script).

Do I have any options left for converting the result tree fragment to a
string?

TIA,

James Garriss
http://garriss.blogspot.com