I find libxslt's / xsltproc's implementation of saxon:line-number() to be very useful and would appreciate having saxon:column-number() implemented too.

I can use saxon's excellent XSLT processor to get this capability.  But I prefer xsltproc because it starts up and runs the transforms quicker. And I need saxon:column-number().  (It's for an XSLT ctags generator.)

I am hoping it will be quick for someone who understands the code base to reference the saxon:line-number() implementation in libexslt/saxon.c and implement a similar saxon:column-number() extension function for me.

Thanks