Macro define_operation_with_response 

macro_rules! define_operation_with_response {
    (
        operation: $op_struct:ident,
        action: $action:literal,
        service: $service:ident,
        request: {
            $($field:ident: $field_type:ty),* $(,)?
        },
        response: $response_struct:ident {
            $($resp_field:ident: $resp_type:ty),* $(,)?
        },
        xml_mapping: {
            $($xml_field:ident: $xml_path:literal),* $(,)?
        } $(,)?
    ) => { ... };
}

Macro for defining operations with XML response parsing

Example

define_operation_with_response! {
    operation: GetVolumeOperation,
    action: "GetVolume",
    service: RenderingControl,
    request: {
        channel: String,
    },
    response: GetVolumeResponse {
        current_volume: u8,
    },
    xml_mapping: {
        current_volume: "CurrentVolume",
    },
}