# FilterSyntax

Enum specifying the syntaxes a filter can use. LIST_FILTER can be used internally.

| Enums ||
|---|---|
| `FILTER_SYNTAX_UNSPECIFIED` | A placeholder for an undefined filter syntax. |
| `PQL` | PQL query syntax. Visit <https://developers.google.com/ad-manager/api/pqlreference> for PQL documentation and examples. |
| `LIST_FILTER` | API list filtering syntax. Read about syntax and usage at <https://developers.google.com/authorized-buyers/apis/guides/v2/list-filters>. |