if (this._storageResolvers.size() == 0) {
// if we do not have storage resolvers, we verify with null
StorageResolver storage = null;
if (keyResolver.canResolve((Element) currentChild,
this.getBaseURI(), storage)) {
SecretKey sk =
keyResolver.resolveSecretKey((Element) currentChild,
this.getBaseURI(),
storage);