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There is only a little documentation regarding usage of cms:contentload.  This document hopes to expand on that.  

Contentload is a tag that will let you load a CMS resource as an object, and manipulate it using jsp tags.  More detail is available in the documentation included with OpenCms.

Here is an example where an asterisk is used for pattern matching in the param section:

<code lang="html4strict">
  <cms:contentload collector="allInFolderPriorityDateDesc" param="${opencms.folder}news${*}.html|news|15" editable="true">
    <%-- create a date object from date value --%>	
    <li>
      <a href="<cms:link><cms:contentshow element="${opencms.filename}" /></cms:link>" title="<cms:contentshow element="Title" />"></a>
      <p><cms:contentshow element="Teaser" /></p>
    </li>
  </cms:contentload>
</code>

Important note, if you are running OpenCms 7 or newer, use <tt>%(opencms.folder)</tt>, <tt>%(opencms.filename)</tt>, etc, since the macro syntax is now "%()".