-// class JcrKeyIterator implements Iterator<QName> {
-// private final PropertyIterator propertyIterator;
-//
-// protected JcrKeyIterator(PropertyIterator propertyIterator) {
-// this.propertyIterator = propertyIterator;
-// }
-//
-// @Override
-// public boolean hasNext() {
-// return propertyIterator.hasNext();
-// }
-//
-// @Override
-// public QName next() {
-// Property property = null;
-// try {
-// property = propertyIterator.nextProperty();
-// // TODO map standard property names
-// return NamespaceUtils.parsePrefixedName(provider, property.getName());
-// } catch (RepositoryException e) {
-// throw new JcrException("Cannot retrieve property " + property, null);
-// }
-// }
-//
-// }