Overview

Keywords are words or phrases that describe the metadata resource.  They facilitate search, indexing and discovery of metadata, and are the largest single component of many metadata collections, regardless of the dialect.

Using common types to classify keywords is critical for consistent discovery, particularly using faceted searches. Shared vocabularies that include these new types are important contributor to consistent, interoperable metadata. The keyword types in italics are supported by NASA Global Change Master Directory (GCMD) and used in many existing metadata collections.

Conceptual Model (UML)

The UML for the object includes keyword, type, and thesaurusName fields.  A minimum of one keyword field is mandatory.  The type field

Implementation (XML)

Usage

ECHO to ISO Keyword Mapping