Keyword (Ancillary Keyword)
 
Definition

The <Keyword> field allows authors to provide any words or phrases needed to further describe the data set.
 
Syntax

<Keyword> text up to 160 characters </Keyword>

  • The <Keyword> field may contain up to 160 characters from the printable ASCII character set.
 
Usage
  • The <Keyword> field is optional and may be repeated.
  • Ancillary keywords that are not found in the controlled keyword lists may be provided.

 

Example

<Keyword> Aerosol Optical Depth</Keyword>
<Keyword> Ceiling Height</Keyword>
<Keyword> Diffuse Radiation</Keyword>
<Keyword> Extraterrestrial Radiation</Keyword>
<Keyword> Global Radiation</Keyword>
<Keyword> Kentucky</Keyword>
<Keyword> Sargasso Sea</Keyword>

 

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This document should be cited as:
Directory Interchange Format (DIF) Writer's Guide, 2007.
Global Change Master Directory. National Aeronautics and Space Administration. [http://gcmd.nasa.gov/User/difguide/].