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[ddlm-group] Adding a DDLm attribute for uniqueness

Dear DDLm group,

A proposal has been put forward to enhance DDLm by the addition of an attribute that specifies that values of an item or group of items must be unique within a loop. This is something that was present in DDL1 and is absent in DDL2 and DDLm. The details of the proposal and some initial discussion are available at https://github.com/COMCIFS/cif_core/issues/119 .

Please provide your thoughts on this proposal.

best wishes,
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