+table(table table-bordered table-condensed).
+|_. Attribute|_. Type|_. Description|_. Example|
+|sequence|integer|Execution sequence.
+A step cannot be run until all steps with lower sequence numbers have completed.
+Job steps with the same sequence number can be run in any order.||
+|parameters|hash|||
+|output|text|||
+|progress|float|||
+|success|boolean|Is null if the task has neither completed successfully nor failed permanently.||