title: Concatenating two variables in xslt (non-numeric and/or numeric)
body: <p>i have two variables in xslt,i am not able to add those and assign to another variable,
  Any help would be appreciated.</p>
  
  <pre><code>&lt;xsl:variable name="Book" select="hummpty" /&gt;
  &lt;xsl:variable name="Book1" select="andro" /&gt;
  &lt;xsl:variable name="Total"&gt;
  &lt;xsl:value-of select="$Book + $Book1/&gt;
  &lt;/xsl:variable&gt;
  </code></pre>
  
  <p>When i try to print 'Total' i am getting value as NaN.
  How do i achieve this? After achieving this , i would like to assign this as an attribute value.
  eg:</p>
  
  <pre><code>&lt;Book totakBook="$Total" /&gt;
  </code></pre>
  
  <p>Something like above.
  Any help appreciated.</p>