The ChildElementSchemas method is received by the server in an RPC_REQUEST packet. In response, the server returns the schema and constraints of any child elements that are contained in the corresponding IAppHostElement object.

 [propget] HRESULT ChildElementSchemas(
   [out, retval] IAppHostElementSchemaCollection** ppChildSchemas
 );

ppChildSchemas: Contains the schema collection of the supported child IAppHostElement objects.

Return Values: The server MUST return zero if it successfully processes the message that is received from the client. In this case, *ppChildSchemas is not NULL. If processing fails, the server MUST return a nonzero HRESULT code as defined in [MS-ERREF]. The following table describes the error conditions that MUST be handled and the corresponding error codes. A server MAY return additional implementation-specific error codes.

Return value/code	Description
0X00000000 NO_ERROR	The operation completed successfully.
0X80070057  ERROR_INVALID_PARAMETER	One or more parameters are incorrect or null.
0X00000008  ERROR_NOT_ENOUGH_MEMORY	Not enough memory is available to process this command.