A listing group criterion.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v26/common/criteria.proto)

| Fields ||
|---|---|
| ## `case_value` | `https://developers.google.com/google-ads/api/reference/rpc/v26/ListingDimensionInfo` Dimension value with which this listing group is refining its parent. Undefined for the root group. |
| ## `parent_ad_group_criterion` | `string` Resource name of ad group criterion which is the parent listing group subdivision. Null for the root group. |
| ## `path` | `https://developers.google.com/google-ads/api/reference/rpc/v26/ListingDimensionPath` The path of dimensions defining this listing group. |
| ## `type` | `https://developers.google.com/google-ads/api/reference/rpc/v26/ListingGroupTypeEnum.ListingGroupType` Type of the listing group. |