# Patchjobapplicationbuild

The PatchJobApplicationBuild element describes an old ApplicationBuild ID and a new one to replace the old with.

This element is one of the [PatchJob](/game-hosting/elements/patchjob.md) properties that define the selection of ApplicationInstances to patch. Additionally it defines which new ApplicationBuild to deploy over the olde one.

The other PatchJob properties that create the selection of ApplicationInstances are:

* DeploymentEnvironment ID (`PatchJob.deploymentEnvironmentId` property)
* Application ID (`PatchJob.applicationId` property)
* One or more Fleet IDs (`PatchJob.fleet` property)

## Element structure

| Property              | Value type | Required  | Description                                           |
| --------------------- | ---------- | --------- | ----------------------------------------------------- |
| id                    | string     | Read-only | Unique identifier of this element                     |
| oldApplicationBuildId | string     | Yes       | The ApplicationBuild ID to replace                    |
| newApplicationBuildId | string     | Yes       | The ApplicationBuild ID that will replace the old one |

Table 1: PatchJobApplicationBuild element structure

## API example

This element is not created individually, but is included in, and created with the [PatchJob](/game-hosting/elements/patchjob.md) element.


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