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
}
							IDelta delta = new EMFModelDeltaSet(object, attributeFeature,
									objectReferences);
							compositeDelta.add(delta);
						} else {
							object.eSet(attributeFeature, getValue(attributeFeature, item
									.getAttribute(attributeName)));
						}
					}
				}
			}
		}
		return compositeDelta;
	}
	private Object createObject(Collection<ModelDelta> deltas, Element reference,
			List<Object> references) {
		return createObject(deltas, reference.getAttribute(TYPE_ATTNAME), reference, references);
	}
	private ModelDelta createUnorderedChainedAttributeDelta(EObject object,
			EStructuralFeature feature, Element node, String featureName) {
		Set<Object> values = new HashSet<Object>();
		NodeList attributes = (NodeList) node;
		for (int j = 0; j < attributes.getLength(); j++) {
			Element attribute = (Element) attributes.item(j);
			Object value = getValue(feature, attribute.getAttribute(featureName));
			values.add(value);
		}
		List<?> currentValues = (List<?>) object.eGet(feature);
		values.addAll(currentValues);
		return new EMFModelDeltaSet(object, feature, new ArrayList<Object>(values));