title: XML attribute space separated character list cannot contain both single and double quotes
body: <p>I am using deltaxml (www.deltaxml.com) to compare 2 XML files.
  I need to modify define-punctuation.xsl (XSLT) file.</p>
  
  <p>To change the characters that should be treated as punctuation, the deltaxml:punctuation attribute should be included in an element with the punctuation characters in a space separated list. </p>
  
  <p>This is what I am trying to use for select attribute:</p>
  
  <p>&lt;xsl:param name="punctuation" select=". , ; : ! ( ) [ ] { } - / &amp; @ \ # % ? ' &quot; ‘ ’ “ ” * $ € £ ¥ "/></p>
  
  <p>I get an error in Visual Studio 2010 XML editor:<br>
  Expected end of the expression, found ','.   .  -->,&lt;--  ; : ! ( ) [ ] { } - / &amp; @ \ # %...</p>
  
  <p>I think the problematic punctuation characters are ' and "</p>
  
  <p>This works: select="&quot;'&quot; for single quote, as well as<br>
  select="'&amp;quot ;'"  (there is no space between 't' and ';')
  , but I cannot have a single and double quote combined in select attribute.</p>
  
  <p>So how to have them in select attribute?
  Thanks</p>