| Namespace | (none) |

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| Name | Type | Use | Default | Fixed | Description |
|---|---|---|---|---|---|
| Name | xs:string | required | The name of the field on which the entities are grouped. | ||
| Value | required | The value of the field for this group. If the group-by field is a reference to another entity, this is the ID of the referenced entity. | |||
| Expression | required | An expression that can be used in a filter. | |||
| ReferenceValue | optional | If the group-by field is a reference to data from another entity, this is a value of the referenced field. For group-by fields that contain data of this entity, this attribute is meaningless. | |||
| size | xs:integer | required | The number of entities in the group. |
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