xs:keyRef
The xs:keyRef Component

Specifies that an attribute or element value corresponds to that of the specified key or unique element. See more info at http://www.w3.org/TR/xmlschema11-1/#element-keyref.
A keyref by default displays the Referenced Key property when rendered.
xs:keyRef Properties
| Property Name | Description | Possible Values |
|---|---|---|
| Name | The keyref name. Always required. | Any NCName. |
| Referenced Key | The name of referenced key. | any declared element constraints. |
| ID | The component id. | Any ID. |
| Component | The edited component name. | Not editable property. |
| Namespace | The component namespace. | Not editable property. |
| System ID | The component system id. | Not editable property. |