Yes but my original question was what was the type of

<xsl:variable name="thing">"<xsl:value-of
select="replace(.,',',concat($quot,',',$quot))"/>"</xsl:variable>

If you use xsl:variable with no as attribute and no select attribute you
get a document() node, in this case a document node with single child
being the concatenation of the atomized values returned by the sequence
selected by xsl:value-of.

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