[xsl] Turning escaped mixed content back to XML

Hi there,

I'm trying to process an ODS spreadsheet which has <text:p> nodes which 
contain embedded mixed-content markup in escaped form:
<text:p>indicates the amount by which this zone has been rotated 
clockwise, with respect to the normal orientation of the parent 
&lt;gi&gt;surface&lt;/gi&gt; element as implied by the dimensions given 
in the &lt;gi&gt;msDesc&lt;/gi&gt; element or by the coordinates of the 
&lt;gi&gt;surface&lt;/gi&gt; itself. The orientation is expressed in arc 
degrees.</text:p>
I need to turn this back into parsed XML for insertion into XML 
documents. I'm using Saxon 9.4 with XSLT 2 (and I can use 3 if 
necessary). I've tried a variety of approaches involving saxon:serialize 
with disable-output-escaping, feeding into saxon:parse, but the output 
always ends up being escaped just like the input. Does anyone have 
experience of doing this?
Here's the sort of thing I've tried:

[...]
    <xsl:output name="outputSerializedTEI" method="xml" indent="no" 
encoding="UTF-8" exclude-result-prefixes="#all" 
omit-xml-declaration="yes" />
[...]

    <xsl:template match="text:p" exclude-result-prefixes="#all">
        <xsl:variable name="unparsed">
            <xsl:copy-of select="*|text()"/>
        </xsl:variable>
            <xsl:variable name="parsed" 
select="saxon:parse(saxon:serialize($unparsed, 'outputSerializedTEI'))"/>
            <tei:p>
                <xsl:copy-of select="$parsed"/>
            </tei:p>
    </xsl:template>

Cheers,
Martin


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