Mapping fields and multiple values with XML

Question

I need to design an XML file that would map fields and field values of two objects, say A and B. Fields are mapped one-to-one and values - many-to-one.

So far I could think of this design:

<obj_mapping>
    <field>
        <A_field>A_field_name</A_field>
        <B_field>B_field_name</B_field>
        <value_mapping>
            <A_value name="A_value">
                <B_value>B_value_1<B_value>
                <B_value>B_value_2<B_value>
                ...
            </A_value>
            ...
        </value_mapping>
    </field>
    ...
</obj_mapping>

Do you feel like this is good enough?