testDirectSimulator.xml

<beast version="2.0" namespace="beast.core
                              :beast.evolution.alignment
                              :beast.evolution.tree
                              :beast.math.distributions
                              :beast.evolution.speciation
                              :beast.core.util
                              :beast.core.parameter">



    <run spec="DirectSimulator" nSamples="100">

        <distribution spec="CompoundDistribution" id="fullModel">
            <distribution spec="YuleModel" id="yuleModel">
                <tree spec="Tree" id="tree">
                    <taxonset spec="TaxonSet">
                        <taxon spec="Taxon" id="t1"/>
                        <taxon spec="Taxon" id="t2"/>
                        <taxon spec="Taxon" id="t3"/>
                        <taxon spec="Taxon" id="t4"/>
                        <taxon spec="Taxon" id="t5"/>
                    </taxonset>
                </tree>
                <birthDiffRate spec="RealParameter" id="birthDiffRateParam" value="1.0"/>
            </distribution>

            <distribution spec="beast.math.distributions.Prior" id="birthDiffRatePrior">
                <distr spec="Exponential" id="xExpParamDist" mean="1"/>
                <x idref="birthDiffRateParam"/>
            </distribution>

        </distribution>

        <logger logEvery="1" fileName="$(filebase).log">
            <log idref="birthDiffRateParam"/>
            <log id="clockRate" spec="beast.util.Script" expression="0.5/TreeHeight">
            	<x id="TreeHeight" spec="beast.evolution.tree.TreeHeightLogger" tree="@tree"/>
            </log>
            <log idref="TreeHeight"/>
        </logger>

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