code: JMFSchema findSchema(long schemaId) throws MessageStoreException {
      Long storeId = schemaIndex.get(Long.valueOf(schemaId));
      if (storeId != null) {
        AbstractItem item = findById(storeId.longValue());
        return ((SchemaStoreItem)item).getSchema();
      } else
        throw new MessageStoreException("Schema not found in store: " + schemaId);
    }
docs: Restore a schema definition from the store