title: SOAPUI - xpath engine/parser seems that arthmetic operations do not works there
body: <p>I have following problem.</p>
  
  <p>I am sending SOAP request and after getting response I need to "Get Data" from it, add "1" and send back as another SOAP request.</p>
  
  <p>My SOAP response to analyze is like that:</p>
  
  <pre><code>&lt;multiRef id="id0" soapenc:root="0" &gt;
           &lt;name xsi:type="soapenc:string"&gt;basketId&lt;/name&gt;
           &lt;value xsi:type="soapenc:string"&gt;12&lt;/value&gt;
        &lt;/multiRef&gt;
  </code></pre>
  
  <p>I want to get that 12 and add 1 to it: I do it in SOAP UI by XPATH inserted in new request (I do not want to use anything else). Pure XML of new request looks like that:</p>
  
  <pre><code>&lt;multiRef id="id1" soapenc:root="0" &gt;
      &lt;name xsi:type="soapenc:string"&gt;basketId&lt;/name&gt;
      &lt;value xsi:type="soapenc:string"&gt;${GetBasketID_3#Response#//multiRef[name="newBasketId"]/value/text() +1 }&lt;/value&gt;
  &lt;/multiRef&gt;
  </code></pre>
  
  <p>the xpath expression is:</p>
  
  <pre><code>//multiRef[name="newBasketId"]/value/text() + 1 
  </code></pre>
  
  <p>With xpathchecker in Firefox this works, but SOAP UI sends empty value there.
  How can I make push SOAP UI xpath parser to work or write xpath expression in working way?</p>