Whitespace in example

With the XHTML version of MathML 2.0 CR, several examples
render a bit poorly. For instance, in example 3.4.4.3
word "versus" is too close to both the last character of
the previous expression (z) and the first of the following
one (x). I suggest to replace

   <mtext> versus </mtext>
by
   <mtext> &nbsp;versus&nbsp; </mtext>

Vincent.
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Vincent Quint                       INRIA Rhone-Alpes
W3C/INRIA                           ZIRST
e-mail: Vincent.Quint@w3.org        655 avenue de l'Europe
Tel.: +33 4 76 61 53 62             38330 Montbonnot St Martin
Fax:  +33 4 76 61 52 07             France