Is there a way to dynamically load a properties file in NAnt?

<property name="environment" value="local" />

<target name="config">
    <!-- configuration logic goes here -->
</target>

<target name="buildmyproject" depends="config">
    <!-- this target builds your project, but runs the config target first -->
</target>

<target name="config">
    <property name="configFile" value="${environment}.config.xml" />
    <if test="${file::exists(configFile)}">
        <echo message="Loading ${configFile}..." />
        <include buildfile="${configFile}" />
    </if>
    <if test="${not file::exists(configFile) and environment != 'local'}">
        <fail message="Configuration file '${configFile}' could not be found." />
    </if>
</target>

<include buildfile="devPropertyFile.build" if="${buildEnvironment == 'DEV'}"/>
<include buildfile="testPropertyFile.build" if="${buildEnvironment == 'TEST'}"/>
<include buildfile="prodPropertyFile.build" if="${buildEnvironment == 'PROD'}"/>

<target name="dev">
  <property name="environment" value="dev"/>
  <call target="importProperties" cascade="false"/>
</target>

<target name="test">
  <property name="environment" value="test"/>
  <call target="importProperties" cascade="false"/>
</target>

<target name="stage">
  <property name="environment" value="stage"/>
  <call target="importProperties" cascade="false"/>
</target>

<target name="importProperties">
  <property name="propertiesFile" value="properties.${environment}.build"/>
  <if test="${file::exists(propertiesFile)}">
    <include buildfile="${propertiesFile}"/>
  </if>
  <if test="${not file::exists(propertiesFile)}">
    <fail message="Properties file ${propertiesFile} could not be found."/>
  </if>
</target>

<project default="all">
 <include buildfile="wip.build"/>
 <target name="all">
  <echo message="Building default target " />

  <call target="WipTarget" />
 </target>
</project>