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Entry Identifier

The <Entry_ID> is the unique identifier of the metadata record. The <Entry_ID> is determined by the metadata author and may be identical to identifiers used by the service provider’s organization. For example, the National Snow and Ice Data Center (NSIDC) DAAC identifies their metadata records as NSIDC-xxxx, where xxxx is a numerical designator. Also, the identifier is case insensitive meaning nsidc-xxxx and NSIDC-xxx refer to the same metadata record.

<Entry_ID>text entry identifier</Entry_ID>

  • The <Entry_ID> consists of 1 to 80 alphanumeric characters of the UTF-8 set, including underbar (_), hyphen (-) and period (.)
  • The following characters are not allowed in the <Entry_ID>:
    • Backward Slash ( / )
    • Forward Slash ( \ )
    • Colon ( : )
    • Spaces (  )
  • The <Entry_ID> is required and is not repeatable.


The following would not be allowed:
<Entry_ID>CoCoRaHS/5</Entry_ID>. Theforward slash (/) is not an allowed character.


This document should be cited as:
Service Entry Resource Format (SERF) Writer's Guide, 2018.
Global Change Master Directory.
National Aeronautics and Space Administration.

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