code: public Map<String, Boolean> getExistsResource() {
  
          if (m_existsResource == null) {
              // create lazy map only on demand
              m_existsResource = CmsCollectionsGenericWrapper.createLazyMap(new CmsExistsResourceTransformer());
          }
          return m_existsResource;
      }
docs: Returns a map that lazily checks if a resources exists in the OpenCms VFS.<p>
  
  Usage example on a JSP with the EL / JSTL:<pre>
  &lt;c:if test="${cms:vfs(pageContext).existsResource['/checkme.html']}" &gt;
  The resource "/checkme.html" exists.
  &lt;/c:if&gt;
  </pre>
  
  Usage example on a JSP with the <code>&lt;cms:contentaccess&gt;</code> tag:<pre>
  &lt;cms:contentload ... &gt;
  &lt;cms:contentaccess var="content" /&gt;
  &lt;c:if test="${content.vfs.existsResource['/checkme.html']}" &gt;
  The resource "/checkme.html" exists.
  &lt;/c:if&gt;
  &lt;/cms:contentload&gt;</pre>
  
  @return a map that lazily checks if a resources exists in the OpenCms VFS
  
  @see #getExists() for a short form of this method