label inserted into a hierarchical or classified display to show how the terms have been arranged
A node label contains one of two different types of information: either (1) the name of a facet or subfacet to which following terms belong (this type would be better called a "facet label", but unfortunately this usage is not established in the literature or standards); or (2) the attribute or characteristic of division by which an array of sibling terms has been sorted or grouped.
e.g. the following classified display starts with the facet "disciplines" and changes of facet are shown by node labels of type 1, shown in parentheses. A node label of type 2 is shown in angle brackets:
photography
- (people)
- photographic models
- -
- - female photographic models
- - male photographic models
- photographers
- (operations)
- taking photographs
- developing
- printing
- (objects)
- cameras
- photographs
- - black and white photographs
- - colour photographs