Thesaurus Hierarchy Registry entry

Specify which hierarchy mechanism is used by a Thesaurus (Single or Multiple).

Usage

This Registry entry is assigned at the system level only:

Key	System
Key 1	System
Key 2	Setting
Key 3	Thesaurus Hierarchy
Key 4	acronym
Value	type

where:

acronym	is the label for the Thesaurus.
type	can be either:
	Single specifies a Thesaurus with a single broader term for each record or multiple broader terms and the same narrower terms for each of the broader terms. Note: If an entry is not present for a Thesaurus, a default hierarchy type of Single is assumed. Multiple specifies a Thesaurus with multiple broader terms and different narrower terms for each broader term.

Note: Details about thesaural hierarchies are available in How to create a new Thesaurus.

Example

The MESH D Thesaurus has a multiple hierarchy structure:

Key	Setting
Key 1	System
Key 2	Setting
Key 3	Thesaurus Hierarchy
Key 4	MESH D
Value	Multiple