Is there a document which has information on using Data Objects in JBPM 5 ?

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Issue

Red Hat JBoss BRMS Business Process Management Guide doesn't have substantial information for using Data Objects in JBPM 5 . Is there any other document which has information on using Data Objects in JBPM 5 ?
Is there an example which shows a way to use information from Data Objects in a jBPM process?
Is this information persisted in the DB?

Environment

Red Hat JBoss BRMS (BRMS)
- 5.3.x

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