src/main/java/com/conveyal/gtfs/GTFS.java
public static ValidationResult validate (String feedId, DataSource dataSource) {
        Feed feed = new Feed(dataSource, feedId);
        ValidationResult result = feed.validate();
        return result;
    }
public static ValidationResult validate (String feedId, DataSource dataSource) {
        Feed feed = new Feed(dataSource, feedId);
        ValidationResult result = feed.validate();
        return result;
    }
Once a feed has been loaded into the database, examine its contents looking for various problems and errors.