[development] false alarm - old schema in system.install

In a default Drupal install there is exactly one URL alias:

modules/system/system.install: $ret[] = update_sql("INSERT INTO {url_alias} (src, dst) VALUES ('node/feed', 'rss.xml')"); modules/system/system.install: $ret[] = update_sql("INSERT INTO {url_alias} (src, dst) VALUES ('rss.xml', 'node/feed')");

I think the lines that you quote are from old updates. A fresh site does not have any url aliases anymore. see http://drupal.org/node/29326.