The source code schema for the WiX Toolset DirectX Extension. Schedules the WixToolset.DirectX.wixext custom action for the current platform to detect DirectX capabilities. For more information, see [DirectX custom actions](../../../tools/wixext/directx). Extensibility point in the WiX XML Schema. Schema extensions can register additional elements at this point in the schema. Extensibility point in the WiX XML Schema. Schema extensions can register additional attributes at this point in the schema.