OSID — Hierarchy Entities

Hierarchy

The Hierarchy OSID is an auxiliary service providing a means for accessing and managing hierarchical relationships among OSID Ids.

An OSID Id may have onr or more parents or children and the hierarchy itself represents a directed acyclic graph. The hierarchy service defines a set of interfaces used among other OSIDs that utilize hierarchies and can also be used to abstract hierarchical data into a standalone service.

Hierarchical queries may be performed using the HierarchyTraversalSession. A set of methods exist to query parents, children, ancestors, and decendants. A Node structure may be retrieved to access a portion of a hierarchy in bulk. The Node provides methods to get parents and children of the node directly.

Hierarchies are federateable by combining nodes. There is no hierarchy service for the hierarchy catalog.

Hierarchy

Osid Catalog

A Hierarchy represents an authenticatable identity. Like all OSID objects, a Hierarchy is identified by its Id and any persisted references should use the Id.

Like all OsidObjects, Hierarchy is managed by its OsidSessions and may not be accessed by concurrent processing threads.

Inherited elements

Name	Syntax	Many	Description
Identifiable
`id`	id		the `Id`
Extensible
`recordTypes`	type	⋆	the record types available
Browsable
`properties`	Property	⋆	a list of properties
OsidObject
`displayName`	displaytext		the display name
`description`	displaytext		the description
`genusType`	type		the genus type of this object
Sourceable
`providerId`	id		the provider `Id`
`provider`	Resource		the provider
`brandingIds`	id	⋆	a list of asset `Ids`
`branding`	Asset	⋆	a list of assets
`license`	displaytext		the license