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[xsl] processing-instruction()

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What's wrong?

I'm trying to match processing instructions. I want to get rid of the <?Eqn
TeX input="\hskip -32pt\hbox to32pt{[6]}"?> part in the source file. 

Source file: <equation> and <inlineequation> mixed with text and markup.
XSLT: I match every <equation> and <inlineequation> and copy recursively any
attributes and elements. I match processing instructions and remove them all
(but I want to keep some of them later).
output: no processing instructions removed.

Am I doing the right thing to match the processing instructions? See
stylesheet below.

Thanks.

Peiyun


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source: equations mixed with text.
<doc>Text before equations.
<inlineequation id="il1"><?Pub Eqn?>
<f><rm><a><ac>CV</ac><ac>&d4;</ac></a><fen lp="par"><rm><g>q</g></rm>
<rp post="par"/></fen></rm></f>
</inlineequation>
More text and other <tags></tags> more text.
<equation id="eqn006"><?Pub Eqn?>
<fd><fl><rm><?Eqn TeX input="\hskip -32pt\hbox to32pt{[6]}"?></rm>
<rm>Prob<fen lp="par"><mit>m<inf>ij</inf>&vbm0;R<inf>j</inf><rm>,</rm>
<g>p</g><inf>ij</inf></mit><rp post="par"/></fen>=<fen lp="par"><stk>
<lyr><mit>Rj</mit></lyr><lyr><it><mit>m<inf>ij</inf></mit></it></lyr></stk>
<rp post="par"/></fen><g>p</g><sup><mit>m<inf>ij</inf></mit></sup><inf>
<mit>ij</mit></inf></rm><fen lp="par">1-<g>p</g><inf>ij</inf><rp
post="par"/></fen>
<sup>R<inf>j</inf>-m<inf>ij</inf></sup></fl></fd>
</equation>
<moretext></moretext> more text.
</doc>
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output: equations without text.

<equations>
<inlineequation id="il1"><?Pub Eqn?>
<f><rm><a><ac>CV</ac><ac>&d4;</ac></a><fen lp="par"><rm><g>q</g></rm>
<rp post="par"/></fen></rm></f>
</inlineequation>
<equation id="eqn006"><?Pub Eqn?>
<fd><fl><rm><?Eqn TeX input="\hskip -32pt\hbox to32pt{[6]}"?></rm>
<rm>Prob<fen lp="par"><mit>m<inf>ij</inf>&vbm0;R<inf>j</inf><rm>,</rm>
<g>p</g><inf>ij</inf></mit><rp post="par"/></fen>=<fen lp="par"><stk>
<lyr><mit>Rj</mit></lyr><lyr><it><mit>m<inf>ij</inf></mit></it></lyr></stk>
<rp post="par"/></fen><g>p</g><sup><mit>m<inf>ij</inf></mit></sup><inf>
<mit>ij</mit></inf></rm><fen lp="par">1-<g>p</g><inf>ij</inf><rp
post="par"/></fen>
<sup>R<inf>j</inf>-m<inf>ij</inf></sup></fl></fd>
</equation>
</equations>
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stylesheet:
  <xsl:template match="/">     
     <equations>
        <xsl:for-each select="//equation|//inlineequation" >
          <xsl:copy>
             <xsl:copy-of select="@*" />
             <xsl:apply-templates select="node()" />
             <xsl:apply-templates select="processing-instruction('Eqn')" />
             <xsl:apply-templates select="processing-instruction('Pub')" />
          </xsl:copy>
        </xsl:for-each>
     </equations>       
  </xsl:template>
  
  <xsl:template match="node()">
       <xsl:copy>
            <xsl:copy-of select="@*" />
            <xsl:apply-templates select="node()" />
             <xsl:apply-templates select="processing-instruction('Eqn')" />
             <xsl:apply-templates select="processing-instruction('Pub')" />
       </xsl:copy>
  </xsl:template>
  
  <xsl:template match="processing-instruction('Eqn')">
      <!-- do nothing now -->
  </xsl:template>
  
  <xsl:template match="processing-instruction('Pub')">
      <!-- do nothing now, but want to keep -->
  </xsl:template>
 
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desired output: (inline)equations only and without <?Eqn ...?> 
<equations>
<inlineequation id="il1"><?Pub Eqn?>
<f><rm><a><ac>CV</ac><ac>&d4;</ac></a><fen lp="par"><rm><g>q</g></rm>
<rp post="par"/></fen></rm></f>
</inlineequation>
<equation id="eqn006"><?Pub Eqn?>
<fd><fl><rm></rm>
<rm>Prob<fen lp="par"><mit>m<inf>ij</inf>&vbm0;R<inf>j</inf><rm>,</rm>
<g>p</g><inf>ij</inf></mit><rp post="par"/></fen>=<fen lp="par"><stk>
<lyr><mit>Rj</mit></lyr><lyr><it><mit>m<inf>ij</inf></mit></it></lyr></stk>
<rp post="par"/></fen><g>p</g><sup><mit>m<inf>ij</inf></mit></sup><inf>
<mit>ij</mit></inf></rm><fen lp="par">1-<g>p</g><inf>ij</inf><rp
post="par"/></fen>
<sup>R<inf>j</inf>-m<inf>ij</inf></sup></fl></fd>
</equation>
</equations>
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