Field Definitions are Available Here
Collection
string (80)
The role of the contact (producer, archiver, distributor or data originator).
ORNL DAAC User Services
/Contacts/Contact/Role
/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:pointOfContact/gmd:CI_ResponsibleParty/gmd:role/gmd:CI_RoleCode
Access Information (ECHO)