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The solution for both NASA provided collections and SciOps provided collection is to add the string “Not provided” to expected fields that have no content. This clearly indicates that content is missing, except that tools that read the metadata or translate it must be aware of and consider this convention to get meaningful results. The tools we use for evaluating metadata completeness are agnostic to element and attribute values. Therefore the analysis presented below, which compares NASA Complete with SciOps Complete does not include metadata fields with a value of 'Not Provided'. Below are the fields with 'Not Provided' values that were excluded from NASA Complete with SciOps Complete evaluation
NASA Collections - Fields with ‘Not Provided' values
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/gmi:acquisitionInformation/gmi:instrument/gmi:type
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/gmd:identificationInfo/gmd:status/gmd:MD_ProgressCode
Sciops Collection - Fields with ‘Not Provided' values
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/gmd:identificationInfo/gmd:processingLevel/gmd:code
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