[xsl] xpath syntax error

Hi group,

I was trying to find empty p or q elements in my xml (saxon 9B) with

  <xsl:template match='(p|q)[count(node()) = 0]'/>

This gives me a syntax error. It seems as if the parentheses construct 
is disallowed anyway. If I try the following example from Martin Kay's 
XSLT bible (for xpath 2.0)
<xsl:template match='book/(chapter|appendix)' />

I get

Error at xsl:template on line 14 of 
file:/autofs/srv009bh/home/ruud/leeg.xsl:
  XTSE0340: XSLT Pattern syntax error at char 5 on line 14 in 
{book/(chapter}:
    Unexpected token in pattern, found "("

Why is that?
Do I really have to rewrite my xpath expression to

<xsl:template match='*[self::p or self::q][count(node()) = 0]'/>?


regards, Ruud

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