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

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

• The <Keyword> field may contain up to 160 characters from the UTF-8 character set.

• The <Keyword> field is recommended 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>