...
A set of characteristics describing a Transfer Object Group. Typically there can be multiple Transfer Object Groups conforming to the same Transfer Object Group Type.
Introduction
...
PAIS requires that each transfer object type descriptor Transfer Object Type Descriptor has at least one groupType elementTransfer Object Group Type. Each groupType element Transfer Object Group Type container may contain any number of additional groupType elements and Group Type containers and an unlimited number of dataObjectType elementsData Object Types.
These elements containers are convenient for modeling hierarchies such as directory structures. The groupType is specified in the XML schema and is of type transferObjectGroupType
Transfer Object Group Types
...