A Selector that matches a string in the parameters object passed to it.

<map:selector name="parameter" factory="org.apache.cocoon.selection.ParameterSelector"/>

   <map:select type="parameter">
      <map:parameter name="parameter-selector-test" value="{mySitemapParameter}"/>
      <map:when test="myParameterValue">
         <!-- executes iff {mySitemapParameter} == "myParameterValue" -->
         <map:transform src="stylesheets/page/uk.xsl"/>
      </map:when>
      <map:otherwise>
         <map:transform src="stylesheets/page/us.xsl"/>
      </map:otherwise>
   </map:select>

The purpose of this selector is to allow an action to set parameters and to be able to select between different pipeline configurations depending on those parameters. - from the ParameterSelector source comments

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