Help with string-replace extension.

Hello all,

I've been reading the documentation for the string-replace extension.

http://www.exslt.org/str/functions/replace/index.html

I've spent hours looking at it and experimenting, but try as I might, I 
can't figure out how to make it work. I've read the howto, the 
index.html file, and everything I could find.

An example would be very useful. But all I can find is the template syntax:

<xsl:call-template name="str:replace">
    <xsl:with-param name="string" select="string" />
    <xsl:with-param name="search" select="object" />
    <xsl:with-param name="replace" select="object" />
</xsl:call-template>

And the explanations of what to put in the select attributes hasn't 
helped me. For example, I tried this:

    <xsl:call-template name="str:replace">
       <xsl:with-param name="string" select="." />
       <xsl:with-param name="search" select="i" />
       <xsl:with-param name="replace" select="XXXXX" />
    </xsl:call-template>


This didn't work at all.

I would be grateful if someone could explain to me how to use this 
extension.

Cheers,
Daniel.
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