--- a/platform-extensions/org.ossmeter.platform.metricmanager.rascal/plugin.xml
+++ b/platform-extensions/org.ossmeter.platform.metricmanager.rascal/plugin.xml
@@ -6,10 +6,13 @@
</metricProviderManager>
</extension>
+
+
<extension point="com.googlecode.pongo.runtime.osgi">
<class name="org.ossmeter.metricprovider.rascal.trans.model.RascalMetrics"/>
<class name="org.ossmeter.metricprovider.rascal.trans.model.IntegerMeasurement"/>
<class name="org.ossmeter.metricprovider.rascal.trans.model.RealMeasurement"/>
<class name="org.ossmeter.metricprovider.rascal.trans.model.BooleanMeasurement"/>
+ <class name="org.ossmeter.metricprovider.rascal.trans.model.StringMeasurement"/>
</extension>
</plugin>