Specifies ID of a custom UI element. IDs must be unique across all customizations.
| Namespace | http://schemas.esri.com/DADF/Registry |

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ST_UniqueID Restriction of xs:ID
Specifies ID of a custom UI element. IDs must be unique across all customizations. |
| MinLength | 1 |
| MaxLength | 1024 |
| Pattern | [^.]* |
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