+ <propertyTester
+ class="eu.etaxonomy.taxeditor.featuretree.FeatureTreePropertyTester"
+ id="eu.etaxonomy.taxeditor.featuretree.FeatureTreePropertyTester"
+ namespace="eu.etaxonomy.taxeditor.featuretree.FeatureTreePropertyTester"
+ properties="isFeatureTree"
+ type="org.eclipse.jface.viewers.IStructuredSelection">
+ </propertyTester>