XSL - Escaping an apostrophe during xsl:when test

I have the following code which appears to be failing.

<xsl:when test="$trialSiteName = 'Physician&apos;s Office'"&开发者_如何学Gogt;

Also, visual studio is complaining saying

"Expected end of expression, found 's"

How am I supposed to escape the character?

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XSLT v1.0. Apache XSL-FO processor.

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Much more simple -- use:

   <xsl:when test="$trialSiteName = &quot;Physician&apos;s Office&quot;">

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1. Declare a variable:

   <xsl:variable name="apos" select='"&apos;"'/>
   

2. Use the variable like this in the <xsl:when> clause:

   <xsl:when test="$trialSiteName = concat('Physician', $apos, 's Office')">
   

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' works for XPath 1.0. If you are using XSLT 2.0 with XPath 2.0 try double apostrophe:

<xsl:when test="$trialSiteName = 'Physician''s Office'">

Look for a full explanation by Dimitre Novatchev in his answer Escape single quote in xslt concat function

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in between " you can add what ever special characters you want.

<xsl:when test="$trialSiteName = &quot;Physician's what ever special charactors plainly add Office&quot;">