title: xpath/xslt equal check for multiple values
body: <p>For example I have an xml:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8" standalone="no"?&gt;
  &lt;TemporaryRoot&gt;
      &lt;ProcessPurchaseOrder&gt;
          &lt;DocumentReference&gt;
              &lt;AlternateDocumentID&gt;
                  &lt;ID&gt;0171688401&lt;/ID&gt;
              &lt;/AlternateDocumentID&gt;
              &lt;AlternateDocumentID&gt;
                  &lt;ID&gt;0171688404&lt;/ID&gt;
              &lt;/AlternateDocumentID&gt;
              &lt;AlternateDocumentID&gt;
                  &lt;ID&gt;0171688405&lt;/ID&gt;
              &lt;/AlternateDocumentID&gt;
          &lt;/DocumentReference&gt;
      &lt;/ProcessPurchaseOrder&gt;
      &lt;DbResponse&gt;
          &lt;ResultSet&gt;
              &lt;Row&gt;
                  &lt;Cell name="WEANR" type="VARCHAR2"&gt;0171688401&lt;/Cell&gt;
              &lt;/Row&gt;
              &lt;Row&gt;
                  &lt;Cell name="WEANR" type="VARCHAR2"&gt;0171688404&lt;/Cell&gt;
              &lt;/Row&gt;
          &lt;/ResultSet&gt;
      &lt;/DbResponse&gt;
  &lt;/TemporaryRoot&gt;
  </code></pre>
  
  <p>How to write xpath or xslt code to check if <code>DbResponse/ResultSet/Row/Cell[@name="WEANR"]</code> contain all values from <code>AlternateDocumentID/ID</code>'s</p>
  
  <p>in this example result is false, because <code>DbResponse/ResultSet/Row/Cell[@name="WEANR"]</code> doesn't have <code>0171688405</code> value</p>