Optimistic locking on obj-relationship fields / data-map dtd question

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Another thing I noticed today is that I'm only performing optimistic locking
on obj-attribute fields. This is logical because I only have a "lock"
parameter specified for obj-attributes.

        <obj-entity lock-type="optimistic" name=....>
                <obj-attribute lock="true" name=... />

However, I also want to be able to lock on obj-relationship foreign key
values.

Does it make sense to just add [lock="true"] on the obj-relationship
parameter list?

        <obj-relationship lock="true" name=...>

-Mike

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