EDIT

import org.apache.log4j.Logger;

import org.eclipse.core.expressions.PropertyTester;

import org.eclipse.ui.IEditorInput;

import eu.etaxonomy.taxeditor.bulkeditor.BulkEditor;

	private static final String IS_MERGING_ENABLED = "isMergingEnabled";

    public static final String IS_DERIVED_UNIT_EDITOR = "isDerivedUnitEditor";

    public static final String IS_TAXON_EDITOR = "isTaxonEditor";

    public static final String IS_CONVERT_ENABLED = "isConvertingEnabled";

    public boolean test(Object receiver, String property, Object[] args,

			Object expectedValue) {

		BulkEditor bulkEditor = null;

		bulkEditor = (BulkEditor) receiver;

		if (IS_MERGING_ENABLED.equals(property)) {

			IEditorInput input = bulkEditor.getEditorInput();

        else if(IS_TAXON_EDITOR.equals(property)){

            return bulkEditor.getEditorInput() instanceof TaxonEditorInput;

        }

//		if (("isPublishFlagEditingEnabled").equals(property)) {

//			IEditorInput input = bulkEditor.getEditorInput();

//			if (input instanceof NameEditorInput) {

               style="push">

            <visibleWhen>

               <reference

               </reference>

            </visibleWhen>

         </command>

         </with>

      </definition>

      <definition

         <with

               variable="activeEditor">

            <test

            </test>

         </with>

      </definition>

            class="eu.etaxonomy.taxeditor.bulkeditor.command.BulkEditorPropertyTester"

            id="taxeditor-bulkeditor.PropertyTester"

            namespace="taxeditor-bulkeditor.propertyTester"

            type="eu.etaxonomy.taxeditor.bulkeditor.BulkEditor">

      </propertyTester>

   </extension>