Normalizing accession/catalog numbers and identifiers across units

[thisisaaronland]

It would be helpful if the data for accession numbers or catalog records could be normalized, across institutions, in a consistent identifier element in the descriptiveNonRepeating block.

Specifically, the identifiers that are printed on wall labels (or equivalent) that the public see in the galleries as distinct from the record_ID property which is usually the ID for an online resource (or not in the case of the Cooper Hewitt where the record ID is an accession number rather than the numeric IDs assigned to object pages).

Right now identifiers are contained in the freetext element which is inconsistent and confusing (especially if you're not already versed in the minutiae of how museums operate).

Can the identifiers element be moved in to the descriptiveNonRepeating block and updated to included a flag indicating which of the possible identifiers is used for wall labels (or equivalent) ? Poking around it seems as though NMAAHC records don't have an descriptiveNonRepeating block so perhaps just a top-level identifiers block to include all the possible pointers (inclusive of record_id and record_link and record_guid).

Cooper Hewitt:

    "freetext": {
      "setName": [
        {
          "label": "See more items in",
          "content": "Cooper Hewitt, Smithsonian Design Museum Collection"
        },
        {
          "label": "See more items in",
          "content": "Textiles Department"
        }
      ],
      "date": [
        {
          "label": "Date",
          "content": "ca. 1907"
        }
      ],
      "identifier": [
        {
          "label": "Accession Number",
          "content": "2019-28-18"
        }
      ],

NMAH:

    "freetext": {
      "setName": [
        {
          "label": "See more items in",
          "content": "Work and Industry: Graphic Arts"
        }
      ],
      "identifier": [
        {
          "label": "ID Number",
          "content": "1984.0245.01.014"
        },
        {
          "label": "catalog number",
          "content": "1984.0245.01.014"
        },
        {
          "label": "accession number",
          "content": "1984.0245"
        }
      ],

NMAI:

  "freetext": {
      "setName": [
        {
          "label": "See related items",
          "content": "Sioux"
        },
        {
          "label": "See related items",
          "content": "Adornment/Jewelry"
        }
      ],
      "identifier": [
        {
          "label": "Catalog Number",
          "content": "2/5934"
        },
        {
          "label": "Barcode",
          "content": "025934.000"
        }
      ],

NMAAHC:

    "freetext": {
      "setName": [
        {
          "label": "See more items in",
          "indexedContent": "Records of the Field Offices for the State of Mississippi, Bureau of Refugees, Freedmen, and Abandoned Lands, 1865–1872",
          "content": "Records of the Field Offices for the State of Mississippi, Bureau of Refugees, Freedmen, and Abandoned Lands, 1865–1872"
        },
        {
          "label": "See more items in",
          "indexedContent": "Records of the Field Offices for the State of Mississippi, Bureau of Refugees, Freedmen, and Abandoned Lands, 1865–1872 / Series 3: Subordinate Field Offices / 3.34: Natchez (Southern District of Mississippi) / 3.34.12: Court Records",
          "content": "Records of the Field Offices for the State of Mississippi, Bureau of Refugees, Freedmen, and Abandoned Lands, 1865–1872 / Series 3: Subordinate Field Offices / 3.34: Natchez (Southern District of Mississippi) / 3.34.12: Court Records"
        }
      ],
      "identifier": [
        {
          "label": "Identifier",
          "content": "NMAAHC.FB.M1907, Item 3.34.12.1"
        }
      ],