There are a bunch of 'white space like' characters in the
2000 area. http://www.cs.tut.fi/~jkorpela/chars/spaces.html
lists a few.
Unsure how fussy you want to be Andrew?
Not that fussy :)
The issue stems from where one of my stylesheets should only output an
attribute provided it had content - quite ofter you would get @label="
", it just so happens that one author decided to use @label=" ",
which messed up my output.
It's interesting because afaict the usual methods to check if a string
is empty would all fail in this case.