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The StartConditionOID references a ConditionDef defining the condition under which the transition can be started. As long as the condition is not met, the transition must be considered to be temporary blocked.
When the prior structural element can be considered to be a "visit", the condition can be regarded as a visit exit criterion.
The EndConditionOID references a ConditionDef defining the condition under which the transition can be completed. As long as the condition is not met, the transition to the next actitivity or event must be considered to be temporary blocked. When the target structural element can be considered to be a "visit", the condition can be regarded as a visit entry criterion.