Full message variable initialization from Literal

[Madars Vitolins]

Hello!

Is it possible to initialize message type variable fully using literal
with out specifying to-part?

<assing>
        <copy>
                <from>
                        <literal>
                                ...
                        </literal>
                </from>
                <to variable="msgVar1">
        </copy>
</assing>

For assing/copy that is not problem, but how with inline variable
initialization? Should such way be supported?

Thanks,
Madars