testDirectSimulatorHierarchical.xml

<beast version="2.0" namespace="beast.pkgmgmt:beast.base.core:beast.base.inference
                              :beast.base.evolution.alignment
                              :beast.base.evolution.tree
                              :beast.base.inference.distribution
                              :beast.base.inference.util
                              :beast.base.inference.parameter">


    <parameter spec="RealParameter" id="meanParam" value="1.0"/>


    <run spec="DirectSimulator" nSamples="1">

        <distribution spec="CompoundDistribution">

            <distribution spec="beast.base.inference.distribution.Prior" id="xPriorDist">
                <distr spec="Exponential" id="meanExpParamDist" mean="@meanParam"/>
                <x spec="RealParameter" id="x" value="1.0"/>
            </distribution>

            <distribution spec="beast.base.inference.distribution.Prior" id="meanPriorDist">
                <distr spec="Exponential" id="xExpParamDist" mean="1"/>
                <x spec="RealParameter" idref="meanParam"/>
            </distribution>

        </distribution>

        <logger logEvery="1" fileName="$(filebase).log">
            <log idref="x"/>
            <log idref="meanParam"/>
        </logger>
    </run>
</beast>