function defaultChangeSetAttrs($uuid, $name, $derive, $attrs)
 {
     if (!isset($attrs['gid'])) {
         $attrs['gid'] = "{$uuid}-{$name}";
     }
     if (!isset($attrs['title'])) {
         $attrs['title'] = "{$uuid}-{$name}";
     }
     if (!isset($attrs['balloon_text'])) {
         $attrs['balloon_text'] = "{description}";
     }
     if (!isset($attrs['balloon_color'])) {
         $attrs['balloon_color'] = "#000000";
     }
     if (!isset($attrs['balloon_alpha'])) {
         $attrs['balloon_alpha'] = "70";
     }
     if (!isset($attrs['balloon_text_color'])) {
         $attrs['balloon_text_color'] = "#ffffff";
     }
     if (!isset($attrs['bullet_size'])) {
         $attrs['bullet_size'] = "12";
     }
     if (!isset($attrs['bullet_color'])) {
         $attrs['bullet_color'] = "#000000";
     }
     if (!isset($attrs['bullet'])) {
         $attrs['bullet'] = "round_outlined";
     }
     if (!isset($attrs['visible_in_legend'])) {
         $attrs['visible_in_legend'] = "false";
     }
     return parent::defaultChangeSetAttrs($uuid, $name, $derive, $attrs);
 }
 function defaultChangeSetAttrs($uuid, $name, $derive, $attrs)
 {
     return parent::defaultChangeSetAttrs($uuid, $name, $derive, $attrs);
 }