A Smart Campaign keyword theme constant.

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

| Fields ||
|---|---|
| ## `country_code` | `string` Output only. The ISO-3166 Alpha-2 country code of the constant, eg. "US". To display and query matching purpose, the keyword theme needs to be localized. |
| ## `display_name` | `string` Output only. The display name of the keyword theme or sub keyword theme. |
| ## `language_code` | `string` Output only. The ISO-639-1 language code with 2 letters of the constant, eg. "en". To display and query matching purpose, the keyword theme needs to be localized. |
| ## `resource_name` | `string` Output only. The resource name of the keyword theme constant. Keyword theme constant resource names have the form: `keywordThemeConstants/{keyword_theme_id}~{sub_keyword_theme_id}` |