Listing dimensions for 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 ||
|---|---|
| ## `dimension` Union field. Dimension of one of the types below is always present. `dimension` can be only one of the following: ||
| ### `activity_city` | `https://developers.google.com/google-ads/api/reference/rpc/v26/ActivityCityInfo` The city where the travel activity is available. |
| ### `activity_country` | `https://developers.google.com/google-ads/api/reference/rpc/v26/ActivityCountryInfo` The country where the travel activity is available. |
| ### `activity_id` | `https://developers.google.com/google-ads/api/reference/rpc/v26/ActivityIdInfo` Advertiser-specific activity ID. |
| ### `activity_rating` | `https://developers.google.com/google-ads/api/reference/rpc/v26/ActivityRatingInfo` Rating of the activity as a number 1 to 5, where 5 is the best. |
| ### `activity_state` | `https://developers.google.com/google-ads/api/reference/rpc/v26/ActivityStateInfo` The state where the travel activity is available. |
| ### `hotel_city` | `https://developers.google.com/google-ads/api/reference/rpc/v26/HotelCityInfo` City the hotel is located in. |
| ### `hotel_class` | `https://developers.google.com/google-ads/api/reference/rpc/v26/HotelClassInfo` Class of the hotel as a number of stars 1 to 5. |
| ### `hotel_country_region` | `https://developers.google.com/google-ads/api/reference/rpc/v26/HotelCountryRegionInfo` Country or Region the hotel is located in. |
| ### `hotel_id` | `https://developers.google.com/google-ads/api/reference/rpc/v26/HotelIdInfo` Advertiser-specific hotel ID. |
| ### `hotel_state` | `https://developers.google.com/google-ads/api/reference/rpc/v26/HotelStateInfo` State the hotel is located in. |
| ### `product_brand` | `https://developers.google.com/google-ads/api/reference/rpc/v26/ProductBrandInfo` Brand of a product offer. |
| ### `product_category` | `https://developers.google.com/google-ads/api/reference/rpc/v26/ProductCategoryInfo` Category of a product offer. |
| ### `product_channel` | `https://developers.google.com/google-ads/api/reference/rpc/v26/ProductChannelInfo` Locality of a product offer. |
| ### `product_channel_exclusivity` | `https://developers.google.com/google-ads/api/reference/rpc/v26/ProductChannelExclusivityInfo` Availability of a product offer. |
| ### `product_condition` | `https://developers.google.com/google-ads/api/reference/rpc/v26/ProductConditionInfo` Condition of a product offer. |
| ### `product_custom_attribute` | `https://developers.google.com/google-ads/api/reference/rpc/v26/ProductCustomAttributeInfo` Custom attribute of a product offer. |
| ### `product_grouping` | `https://developers.google.com/google-ads/api/reference/rpc/v26/ProductGroupingInfo` Grouping of a product offer. This listing dimension is deprecated and it is supported only in Display campaigns. |
| ### `product_item_id` | `https://developers.google.com/google-ads/api/reference/rpc/v26/ProductItemIdInfo` Item id of a product offer. |
| ### `product_labels` | `https://developers.google.com/google-ads/api/reference/rpc/v26/ProductLabelsInfo` Labels of a product offer. This listing dimension is deprecated and it is supported only in Display campaigns. |
| ### `product_legacy_condition` | `https://developers.google.com/google-ads/api/reference/rpc/v26/ProductLegacyConditionInfo` Legacy condition of a product offer. This listing dimension is deprecated and it is supported only in Display campaigns. |
| ### `product_type` | `https://developers.google.com/google-ads/api/reference/rpc/v26/ProductTypeInfo` Type of a product offer. |
| ### `product_type_full` | `https://developers.google.com/google-ads/api/reference/rpc/v26/ProductTypeFullInfo` Full type of a product offer. This listing dimension is deprecated and it is supported only in Display campaigns. |
| ### `unknown_listing_dimension` | `https://developers.google.com/google-ads/api/reference/rpc/v26/UnknownListingDimensionInfo` Unknown dimension. Set when no other listing dimension is set. |