6 string references to 'url' in Drupal 4

aggregator_form_feed_validate in modules/aggregator.module

Validate aggregator_form_feed form submissions.

profile_form_profile in modules/profile.module

profile_validate_profile in modules/profile.module

profile_view_field in modules/profile.module

statistics_top_referrers in modules/statistics.module

Menu callback; presents the "referrer" page.

system_update_162 in database/updates.inc