Bug 303831 Warnings logged when trying to merge changes to an MPart's 'closeable' attribute
Warnings are printed out to syserr. --- WARNING: Unknown feature found, reconciliation may fail: Part#closeable
bundles/org.eclipse.e4.ui.workbench/src/org/eclipse/e4/workbench/ui/internal/XMLModelReconciler.java
* @param featureName
	 *            the name of the feature
	 * @return <code>true</code> if this particular feature is a reference to another object,
	 *         <code>false</code> otherwise
	 */
	private static boolean isSingleReference(String featureName) {
		return isDirectReference(featureName) || isIndirectReference(featureName);
	}
	/**
	 * Returns whether the feature is a list of object references.
	 * 
	 * @param featureName
	 *            the name of the feature
	 * @return <code>true</code> if this particular feature is referring to a list of object
	 *         references, <code>false</code> otherwise
	 */
	private static boolean isChainedReference(String featureName) {
		
		return featureName.equals(ELEMENTCONTAINER_CHILDREN_ATTNAME) ||
		
				featureName.equals(BINDINGCONTAINER_BINDINGS_ATTNAME) ||
				
				featureName.equals(PART_MENUS_ATTNAME) ||
				
				featureName.equals(APPLICATION_COMMANDS_ATTNAME) ||
				
				featureName.equals(HANDLERCONTAINER_HANDLERS_ATTNAME);
	}
	private static boolean isUnorderedChainedAttribute(String featureName) {
		return featureName.equals(APPLICATIONELEMENT_TAGS_ATTNAME);