Element Description - Provides a high level definition of the metadata concept
Best Practices - Provides best practices for the metadata concept as well as example values
Element Specification - A table detailing each unique metadata element within the concept. For each metadata element the table specifies:
- The UMM model it is from (UMM-Common, C or G)
- The element name, exactly as it appears in the UMM schema
- The element type (string, decimal, enumeration, boolean, etc.)
- Constraints (e.g. character length restrictions, controlled vocabularies, etc.)
- The cardinality, which specifies how many times the element may be repeated. See the following for a more in depth explanation of cardinality: <insert link>
- Notes: any additional information which may be useful about the element
Metadata Validation and QA/QC - There are various systems in place to ensure a certain standard of metadata quality is maintained in the CMR. The Metadata Validation and QA/QC section of the wiki page provides documentation regarding these efforts and systems:
- GCMD Metadata QA/QC: The GCMD team is responsible for stewardship of metadata records in the CMR provided by any of CMR's International Directory Network (IDN) partners. This section details both the automated and manual checks the GCMD team performs on the IDN records to help maintain a certain standard of quality.
- CMR Validation: The CMR system itself has certain requirements. This section details any baseline CMR requirements for the metadata concept in question.
- ARC Metadata QA/QC: The ARC team is responsible for performing quality assessments of NASA metadata records in the CMR. This section specifies what the ARC team looks for (both manually and in an automated fashion) to ensure NASA's metadata records in the CMR maintain a certain standard of quality.
Dialect Mappings - The Dialect Mapping section provides detailed element-element mappings between the UMM and each CMR supported metadata standard. Current CMR supported metadata standards include:
- DIF 10
- ECHO 10
- ISO 19115-2 MENDS
- ISO 19115-2 SMAP
- Provided for each supported standard:
- An element specification table which includes the direct crosswalk between the UMM element path and the corresponding element path in the supported standard. This table will also indicate if an element in a supported standard does not map to the UMM, or if there are any caveats in the manner that the information gets translated.
- An enumeration mapping table (if applicable) - sometimes there are differences in enumeration values used in a supported standard VS the UMM.
- An example mapping showing how a snippet of metadata in the supported standard will appear in the UMM format. This might illustrate examples of how certain information can get dropped or only partially translated between the supported standard and the UMM.
UMM Migration - If a metadata concept undergoes significant changes between UMM version updates, this section will illustrate how the information provided in the older UMM version of UMM will be gets translated over to the newer version.
Future Mapping - Occasionally, the CMR will consider supporting a new metadata standard. ((is this true? in what cases will support of a new standard be considered? need to confirm)). If the CMR is in the process of building support for a new metadata standard, known documentation for that standard will be provided in the 'Future Mapping' section.
History - Provides a version history for the metadata element in question
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