LevelStructure

Generalization is AnnotatedIdentifiable.

Superclass hierarchy

Definition

Nesting structure of a hierarchical collection.

Examples

ISCO-08 (Major, Sub-Major, and Minor) or NAICS (2 digit sector codes, 3 digit subsector code list, 4 digit industry group code list, and 5 digit industry code list).

Explanatory notes

The levels within the structure begin at the root level ‘1’ and continue as an ordered array through each level of nesting. Levels are used to organize a hierarchy. Usually, a hierarchy often contains one root member at the top, though it could contain several. These are the first Level. All members directly related to those in the first Level compose the second Level. The third and subsequent Levels are defined similarly. A Level often is associated with a Concept, which defines it. These correspond to kinds of aggregates. For example, in the US Standard Occupational Classification (2010), the Level below the top is called Major Occupation Groups, and the next Level is called Minor Occupational Groups. These ideas convey the structure. In particular, Health Care Practitioners (a Major Group) can be broken into Chiropractors, Dentists, Physicians, Vets, Therapists, etc. (Minor Groups) The Categories in the Nodes at the lower Level aggregate to the Category in Node above them.

“Classification schemes are frequently organized in nested levels of increasing detail. ISCO-08, for example, has four levels: at the top level are ten major groups, each of which contain sub-major groups, which in turn are subdivided in minor groups, which contain unit groups. Even when a classification is not structured in levels (“flat classification”), the usual convention, which is adopted here, is to consider that it contains one unique level.” (http://rdf-vocabulary.ddialliance.org/xkos.html#) Individual classification items organized in a hierarchy may be associated with a specific level.


Subclasses


Properties

Name

Description

Data Type

Multi- plicity

name

A linguistic signifier. Human understandable name (word, phrase, or mnemonic) that reflects the ISO/IEC 11179-5 naming principles. If more than one name is provided provide a context to differentiate usage.

ObjectName

0..*

usage

Explanation of the ways in which some decision or object is employed. Supports the use of multiple languages and structured text. Use in locations where you need to relay information on the usage of the instantiated class.

InternationalStructuredString

0..1

validDateRange

The dates for which the level structure is valid. A structured DateRange with start and end Date (both with the structure of Date and supporting the use of ISO and non-ISO date structures); Use to relate a period with a start and end date.

DateRange

0..1

Inherited Properties

Name

Description

Data Type

Multi- plicity

agency

Agency expressed as filed with the DDI Agency ID registry [registry.ddialliance.org] with optional additional sub-agency extensions.

:ref:``

1..1

id

ID conforming to the allowed structure of the DDI Identifier and must be unique within the Agency.

:ref:``

1..1

isPersistent

Default value is false indicating that the content of the current version may change (may be in development mode). Set to true when the content of this version will no longer change.

:ref:``

1..1

isUniversallyUnique

Default value is false. If the id of the object was created as a Universally Unique ID (UUID) set to true.

:ref:``

1..1

localId

Locally used identifier unique with a specified context, such as a variable name within a dataset.

LocalIdFormat

0..*

version

Version number of the object.

:ref:``

1..1

versionDate

Date and time the object was changed expressed in standard ISO formats.

XSDdate

0..1

versionRationale

Reason for making a new version of the object.

RationaleDefinition

0..1

versionResponsibility

Contributor who has the ownership and responsibility for the current version.

:ref:``

0..1

Associations

Multiplicity

Association

Navigable Class

Multiplicity

0..*

LevelStructure_has_Level

LevelStructure

0..*

TBD

Diagram

TBD