id = string_node ("Id");
annotation_text = optional_string_node ("AnnotationText");
issue_date = string_node ("IssueDate");
- creator = string_node ("Creator");
+ creator = optional_string_node ("Creator");
content_title_text = string_node ("ContentTitleText");
content_kind = kind_node ("ContentKind");
content_version = optional_sub_node<ContentVersion> ("ContentVersion");