This schema describes the basic VolunteerMatch listing feed. The feed is meant to include all necessary information for initial feeds, updates, or deletions, without requiring any data that doesn't apply. The date and time this feed was created. If this feed is not a complete feed, when do the entries start? Listings in this feed are assumed to cover all active (i.e., available) listings that have been created or updated between this date and the feed's creation date.