|owner|String| The `appId` of the application that is the owner of the schema extension. The owner of the schema definition must be explicitly specified during the Create and Update operations, or it will be implied and auto-assigned by Microsoft Entra ID as follows: <br/><ul><li>In delegated access: <ul><li>The signed-in user must be the owner of the app that calls Microsoft Graph to create the schema extension definition. </li></ul> <ul><li>If the signed-in user isn't the owner of the calling app, they must explicitly specify the **owner** property, and assign it the **appId** of an app that they own.</li></ul></li></ul> <ul><li>In app-only access: <ul><li> The **owner** property isn't required in the request body. Instead, the calling app is assigned ownership of the schema extension.</li></ul></li></ul> </br>So, for example, if creating a new schema extension definition using Graph Explorer, you **must** supply the owner property. Once set, this property is read-only and cannot be changed. Supports `$filter` (`eq`).|
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