Field Definitions are Available Here
Collection
varstring(80)
Mandatory if applicable
Keyword used to describe the science parameter area of the collection. A collection can conceivably cover many such parameters.
Sea Ice
ECSDisciplineKeyword, ECSTopicKeyword, ECSVariableKeyword, ECSParameterKeyword
Sea Ice
Must be used with ECSDisciplineKeyword, ECSTopicKeyword, ECSVariableKeyword.
METADATA > COLLECTIONMETADATA > DisciplineTopicParameters > DisciplineTopicParametersContainer.ECSTermKeyword
/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:descriptiveKeywords/gmd:MD_Keywords/gmd:keyword/gco:CharacterString
Note: if used, see also - /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:descriptiveKeywords/gmd:MD_Keywords/gmd:type/gmd:MD_KeywordTypeCode
Descriptive Information