Many different types of identifiers are used in NASA metadata and many of these are expressed as additionalAttributes because there is no general mechanism for describing identifiers. Citation.identifier type AdditionalAttributes are translated into ISO MD_Identifiers. The translation is:
AdditionalAttribute/Name > gmd:MD_Identifier/gmd:description/gco:CharacterString
AdditionalAttribute/Values/Value > gmd:MD_Identifier/gmd:code/gco:CharacterString
Examples:
Digital Object Identifiers
/Collection/AdditionalAttributes/AdditionalAttribute
<AdditionalAttribute>
<Name>identifier_product_doi</Name>
<DataType>STRING</DataType>
<Description>Digital object identifier that uniquely identifies this data product</Description>
<Value>10.5067/NIMBUS/NmHRIR3H.001</Value>
</AdditionalAttribute>
<AdditionalAttribute>
<Name>identifier_product_doi_authority</Name>
<DataType>STRING</DataType>
<Description>URL of the digital object identifier resolving authority</Description>
<Value>http://dx.doi.org</Value>
</AdditionalAttribute>
/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:citation/gmd:CI_Citation/gmd:identifier
<gmd:identifier>
<gmd:MD_Identifier>
<gmd:code>
<gco:CharacterString>10.5067/NIMBUS/NmHRIR3H.001</gco:CharacterString>
</gmd:code>
<gmd:codeSpace>
<gco:CharacterString>gov.nasa.echo</gco:CharacterString>
</gmd:codeSpace>
<gmd:description>
<gco:CharacterString>identifier_product_doi - Digital object identifier that uniquely identifies this data product</gco:CharacterString>
</gmd:description>
</gmd:MD_Identifier>
</gmd:identifier>
<gmd:identifier>
<gmd:MD_Identifier>
<gmd:code>
<gco:CharacterString>http://dx.doi.org</gco:CharacterString>
</gmd:code>
<gmd:codeSpace>
<gco:CharacterString>gov.nasa.echo</gco:CharacterString>
</gmd:codeSpace>
<gmd:description>
<gco:CharacterString>identifier_product_doi_authority - URL of the digital object identifier resolving authority</gco:CharacterString>
</gmd:description>
</gmd:MD_Identifier>
</gmd:identifier>
Ordering Id
ECHO: /Granule/AdditionalAttributes/AdditionalAttribute
<AdditionalAttribute>
<Name>OrderingId</Name>
<Values>
<Value>MES-58-45_UR_2000</Value>
</Values>
</AdditionalAttribute>
ISO: /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:citation/gmd:CI_Citation/gmd:identifier
<gmd:identifier>
<gmd:MD_Identifier>
<gmd:code>
<gco:CharacterString>MTS-19-50_LOC</gco:CharacterString>
</gmd:code>
<gmd:codeSpace>
<gco:CharacterString>gov.nasa.echo</gco:CharacterString>
</gmd:codeSpace>
<gmd:description>
<gco:CharacterString>OrderingId</gco:CharacterString>
</gmd:description>
</gmd:MD_Identifier>
</gmd:identifier>
