This is a minor nit. The reference manual does not direct user to do `(use-modules (sxml transform))'
The following patch is wrt guile-2.1.7/doc/ref/sxml.texi --- sxml.texi.orig 2017-02-25 06:33:38.000000000 -0800 +++ sxml.texi 2017-02-25 06:36:00.000000000 -0800 @@ -457,6 +457,8 @@ @node Transforming SXML @subsection Transforming SXML @subsubsection Overview +@code{(sxml transform)} defines a number of procedures for transforming +SXML, analogous to using XSL for XML. @heading SXML expression tree transformers @subheading Pre-Post-order traversal of a tree and creation of a new tree @smallexample