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What is a facet hierarchy?

The facet hierarchy is the display of all terms in the facet in their hierarchical order. The hierarchy level of a term is indicated by the number of dots that precede it. For example here are 3 levels from the Mission and projects facet:

  • Human Exploration and Development of Space
    • Station Programs
      • International Space Station


Clicking on a term in the facet hierarchy returns the term record.

What is a term record?

A term record shows the complete information for a taxonomy term. The illustration shows all the components of a term record.


Engineering

 « This is the taxonomy term.

Used For:

 « Used For terms are alternates or synonyms for the taxonomy term. Note that Used For's are displayed in italics.
  • control engineering
  • cryogenics
  • display engineering
  • fire prevention
  • vacuum technology

Broader Terms:

  • Subject Categories
« The Broader Term is the next
level up in the hierarchy.

Narrower Terms:

 « Narrower Terms are the next level down in the hierarchy.
  • Communications and Radar
  • Electronics and Electrical Engineering
  • Fluid Mechanics and Heat Transfer
  • Instrumentation and Photography
  • Lasers and Masers
  • Mechanical Engineering
  • Quality Assurance and Reliability
  • Structural Mechanics

Scope Note:

 « The Scope Note provides term usage information.

Includes vacuum technology; control engineering; display engineering and cryogenics; and fire prevention. Includes engineering (general); communications and radar; electronics and electrical engineering; fluid mechanics and heat transfer; instrumentation and photography; lasers and masers; mechanical engineering; quality assurance and reliability; and structural mechanics. For related information see also Physics.


Clicking on another term returns that term's record.
Clicking on A-Z Index returns the A-Z navigator for the current facet.
Clicking on Facet Hierarchy returns the current facet hierarchy.


What do italic terms represent?

Italics are used for terms that are alternates or synonyms for another taxonomy term.

What is an A-Z Index?

Clicking on A-Z Index returns the A-Z navigator for the current facet. The A-Z navigator only includes entries for numbers and letters that occur in the index of the current facet. Clicking on a number or letter returns the Term Index of the current number or letter from the current facet. Note that Used for terms appear in italics, while taxonomy terms appear in regular text. Click on a term to return a term record.