# Class CIM_AbstractBasedOn
extends CIM_Dependency

Abstract BasedOn is an association describing how StorageExtents (or views of StorageExtents) can be assembled from lower level Extents (or views of extents).

### Table of Contents
Hierarchy
Direct Known Subclasses
Class Qualifiers
Class Properties
Class Methods

## Class Hierarchy

CIM_Dependency
|
+--CIM_AbstractBasedOn

## Direct Known Subclasses

CIM_BasedOn
CIM_BasedOnView

## Class Qualifiers

Name | Data Type | Value
--- | --- | ---
Abstract | boolean | true
Association | boolean | true
Description | string | Abstract BasedOn is an association describing how StorageExtents (or views of StorageExtents) can be assembled from lower level Extents (or views of extents).
Experimental | boolean | true
UMLPackagePath | string | CIM::Core::StorageExtent
Version | string | 2.28.0

## Class Properties

### Local Class Properties

Name | Data Type | Default Value | Qualifiers
--- | --- | --- | ---
Name | Data Type | Value
EndingAddress | uint64 |
Description | string | EndingAddress indicates where in lower level storage, the higher level Extent ends. This property is useful when mapping non-contiguous Extents into a higher level grouping.
OrderIndex | uint16 |
Description | string | If there is an order to the BasedOn associations that describe how a higher level StorageExtent is assembled, the OrderIndex property indicates this. When an order exists, the instances of BasedOn with the same Dependent value (i.e., the same higher level Extent) should place unique values in the OrderIndex property. The lowest value implies the first member of the collection of lower level Extents, and increasing values imply successive members of the collection. If there is no ordered relationship, a value of zero should be specified. An example of the use of this property is to define a RAID-0 striped array of 3 disks. The resultant RAID array is a StorageExtent that is dependent on (BasedOn) the StorageExtents that describe each of the 3 disks. The OrderIndex of each BasedOn association from the disk Extents to the RAID array could be specified as 1, 2 and 3 to indicate the order in which the disk Extents are used to access the RAID data.
StartingAddress | uint64 |
Description | string | StartingAddress indicates where in lower level storage, the higher level Extent begins.

### Association References

Name | Class Origin | Reference Class | Qualifiers
--- | --- | --- | ---
Name | Data Type | Value
Antecedent | CIM_AbstractBasedOn | CIM_ManagedElement
Description | string | The lower level StorageExtent (or view of the extent).
Key | boolean | true
Override | string | Antecedent
Dependent | CIM_AbstractBasedOn | CIM_ManagedElement
Description | string | The higher level StorageExtent (or view of the extent).
Key | boolean | true
Override | string | Dependent

## Class Methods