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[ddlm-group] Proposal to allow SU corresponding to a givenMeasurand data name to be linked using _name.linked_item_id

  • To: ddlm-group <ddlm-group@iucr.org>
  • Subject: [ddlm-group] Proposal to allow SU corresponding to a givenMeasurand data name to be linked using _name.linked_item_id
  • From: James Hester <jamesrhester@gmail.com>
  • Date: Tue, 24 Jul 2018 13:39:08 +1000
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Dear DDLm group,

(abbreviated text of issue raised at https://github.com/COMCIFS/cif_core/issues/86)

The current DDLm specification provides for a data name that contains the standard uncertainty of another data name to flag this relationship by setting _type.purpose to SU and _name.linked_item_id to the data name that it holds the SU of. However, it is more often useful to search in the opposite direction, that is, given a data name, find the data name that holds the SU. I therefore propose that, when a data name has _type.purpose of Measurand, a data name specified in _name.linked_item_id will hold the standard uncertainty.  Any objections?

James.

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