code: public Map<String, Boolean> getExistsXml() {
  
          if (m_existsXml == null) {
              // create lazy map only on demand
              m_existsXml = CmsCollectionsGenericWrapper.createLazyMap(new CmsExistsXmlTransformer());
          }
          return m_existsXml;
      }
docs: Returns a map that lazily checks if a resources exists in the VFS and is of type XML content or XML page.<p>
  
  Usage example on a JSP with the EL / JSTL:<pre>
  &lt;c:if test="${cms:vfs(pageContext).existsXml['/text.xml']}" &gt;
  The resource "/text.xml" exists and is an XML document.
  &lt;/c:if&gt;
  </pre>
  
  @return a map that lazily checks if a resources exists in the VFS and is of type XML content or XML page