XPath about pi and comment

Hello, all.

In the following source, Is there any way to get "pivalue" and "comment"
by XSLT? I tryed it with node-test function, processing-instruction() and
comment() like this;

<xsl:value-of select="*[processing-instruction()]"/>
<xsl:value-of select="*[comment()]"/>

But it didn't work well. Please give me any comments. Thank you.

-- source --
<?xml version="1.0"?>
<doc>
 <?pi pivalue?>
 <!-- comment -->
 <el>text</el>
</doc>

--
Shinichiro Hamada


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