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  "formatDescription": "From Microsoft Office 2007 onwards, the core output format of MS Excel has been based on the Office Open XML (OOXML) file format. The ISO standard for OOXML is ISO/IEC DIS 29500. An OOXML file format consists of a compressed zip archive that is designated according to which file type it is. Further detail on OOXML can be found within fmt/189 - Microsoft Office Open XML.",
  "releaseDate": null,
  "binaryFileFormat": null,
  "formatNote": null,
  "lastUpdatedDate": "12 Nov 2013",
  "formatProvenance": "This file format is identified by container signature.",
  "formatSourceDate": "12 Nov 2013",
  "formatDisclosure": null,
  "formatEnvironment": null,
  "formatRisk": null,
  "formatAliases": null,
  "formatTypes": "Spreadsheet",
  "formatFamilies": null,
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    {
      "identifierText": "application/vnd.openxmlformats-officedocument.spreadsheetml.template",
      "identifierType": "MIME"
    },
    {
      "identifierText": "fmt/598",
      "identifierType": "PUID"
    }
  ],
  "internalSignatures": [],
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    {
      "externalSignature": "xltx",
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      "relationshipType": "Is subtype of",
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      "relatedFormatName": "Microsoft Excel for Windows",
      "relatedFormatPUID": "fmt/214"
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  ],
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  "developedBy": [
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  "containerSignatures": [
    {
      "containerType": "ZIP",
      "id": "2080",
      "description": "Microsoft Excel OOXML Template (big endian)",
      "files": [
        {
          "path": "[Content_Types].xml",
          "byteSequences": [
            {
              "subSequences": [
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                  "position": "1",
                  "subSeqMinOffset": "0",
                  "subSeqMaxOffset": "1024",
                  "sequence": "'ContentType=\"application/vnd.openxmlformats-officedocument.spreadsheetml.template.main+xml\"'"
                }
              ],
              "reference": "BOFoffset"
            }
          ]
        }
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  ],
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}