表示插槽的模式（即，是否必需）。
| 枚举 | |
|---|---|
MODE_UNSPECIFIED |
未填充用法字段时的后备值。 |
OPTIONAL |
表示完成槽填充不需要该槽。 |
REQUIRED |
表示需要哪个槽才能完成槽填充。 |
SlotMode
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最后更新时间 (UTC)：2025-07-26。
[null,null,["最后更新时间 (UTC)：2025-07-26。"],[[["\u003cp\u003e\u003ccode\u003eMODE_UNSPECIFIED\u003c/code\u003e acts as a default when the usage field is not defined.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eOPTIONAL\u003c/code\u003e signifies that the slot is not mandatory for completing slot filling.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eREQUIRED\u003c/code\u003e indicates that the slot is necessary for completing slot filling.\u003c/p\u003e\n"]]],["The content defines the operational modes of a slot, specifically regarding whether it's required for slot filling. `MODE_UNSPECIFIED` serves as a default. `OPTIONAL` signifies a slot is not mandatory. Conversely, `REQUIRED` means the slot must be filled for completion. These modes control the necessity of a slot within a process. The information is presented in an enum structure with descriptions of the three potential states.\n"],null,["# SlotMode\n\nRepresents the mode of a slot, that is, if it is required or not.\n\n| Enums ||\n|--------------------|-------------------------------------------------------------------|\n| `MODE_UNSPECIFIED` | Fallback value when the usage field is not populated. |\n| `OPTIONAL` | Indicates that the slot is not required to complete slot filling. |\n| `REQUIRED` | Indicates that the slot is required to complete slot filling. |"]]