The GBUdb part of the XCI interface supports one request/response per connection. The <gbudb> element in the request indicates that this request is for the GBUdb engine. In the XCI protocol for GBUdb, the <gbudb> element will contain exactly one element. The inner most element determines whether the XCI message is a result or one of several types of request.

There are 6 different types of formats:

• XCI GBUdb result format
• XCI GBUdb test format
• XCI GBUdb set format
• XCI GBUdb good event format
• XCI GBUdb bad event format
• XCI GBUdb drop format