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
featureElement.setAttribute(UNSET_ATTNAME, UNSET_ATTVALUE_TRUE);
		}
		return featureElement;
	}
	/**
	 * Creates an element to describe that the specified object was a reference that was originally
	 * there when the application started prior to the applying of any deltas. It should be noted
	 * that an object that was originally referenced will not necessarily be dereferenced after any
	 * deltas have been applied.
	 * 
	 * @param document
	 *            the root XML document
	 * @param reference
	 *            the referenced object
	 * @return an XML element to record that the specified object was originally referenced by
	 *         another object when the application started
	 */
	private Element createOriginalReferenceElement(Document document, Object reference) {
		Element referenceElement = document.createElement(ORIGINALREFERENCE_ELEMENT_NAME);
		referenceElement.setAttribute(APPLICATIONELEMENT_ID_ATTNAME, getOriginalId(reference));
		return referenceElement;
	}
	private void appendOriginalReferenceElements(Document document, Element element,
			List<?> references) {
		for (Object reference : references) {
			Element referenceElement = createOriginalReferenceElement(document, reference);
			element.appendChild(referenceElement);
		}
	}
	/**