[xsl] Unicode and <xsl:character-map/>

I am working with Saxon8.

I have a Unicode source XML file that contains the code points °C (U+00B0 and 
U+0043). When I encounter this string pattern I would like to substitute the 
Unicode character for ℃ (U+2103). I have implemented the following code, which 
compiles fine but has no impact on the data. Is there something I am missing?

<xsl:output method="xml" omit-xml-declaration="no" encoding="utf-8" indent="no" 
use-character-maps="degree"/>
       
<xsl:character-map name="degree">
        <xsl:output-character character="&#x2103;" string="&#x00B0;#x0043;"/> 
</xsl:character-map>

Please help me out with this concept.

Steve

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