the topic type. Identifies the different topic types delivered within a Service
bulletin. Attribute sbTopicType must be populated in accordance with the main topic
where the element <sbTopic> is used. The attribute can have one of the following values:
- "sbtt01" thru "sbtt99". and default BREX rules BREX-S1-00095,
BREX-S1-00096, BREX-S1-00097 and BREX-S1-00098.