added owl version info property
formatting; added default constructor; comments
added cascadation
default constructor and add-method for questionText
changed return type of questionText
added default constructor
changed to boolean type
prepared for persistence
changed id value generation
removed construtor arguments for URN
moved from disco-model to gesis-ddi module
added LogicalDataSet property as mappedBy containsVariable
Add group and user class
refactoring runtime Study -> SessionDataSet; is now stored in database
adjustments to changes in disco-model api
increased parent version
extends AbstractBaseEntity
added relation to conceptScheme
renamed AbstractBaseEntity to PersistableResource
removed unused type