Default Bean Validation group.
Package javax.validation.groups Description
A group defines a subset of constraints. Instead of
validating all constraints for a given object graph,
only a subset is validated depending on the group targeted.
Each constraint declaration defines the list of groups it belongs to.
If no group is explicitly declared, a constraint belongs to the Default group.
When applying validation, the list of target group is passed along.
If no group is explicitly passed along, the Default group is used.