1. CWM: A Model-based Architecture For Data Warehouse Interchange
Doug Tolbert
Pacific Development Lab
Unisys Corporation
Mission Viejo, CA

2. CWM Submitters & Supporters
IBM
Unisys
Oracle
NCR
Hyperion
UBS AG
Genesis Development
Dimension EDI
OMG Specs:
CWM Info:
Supporters
Deere & Co.
Sun Microsystems
Hewlett-Packard
Data Access Technologies
InLine Software
Aonix
Hitachi

3. The CWM Metamodel

4. OMG Metamodel Architecture
D D L E W
A R E
A P P C A T O N
User Data/Object
Layer (M0)
Metadata/Model
Layer(M1)
Metamodel
Layer(M2)
Meta-metamodel
Layer (M3)
<Stock name=“IBM”
price=“112”/>
Stock: name, price
UML: Class, Attribute
CWM: Table, Column
ElementType, Attribute
MOF: Class, Attribute,
Operation,
Association
Standard OMG Components
Modeling Language: UML
Metadata Interchange: XMI
Metadata API:
MOF IDL Mapping

5. (Foundation, Behavioral_Elements, Model_Management)
The CWM Metamodel
Warehouse
Process
Operation
Transformation
XML
Record
Multi
Dimensional
Relational
Business
Information
Software
Deployment
UML 1.3
(Foundation, Behavioral_Elements, Model_Management)
Management
Resource
Analysis
Object
(UML)
Foundation
OLAP
Data
Mining
Visualization
Nomenclature
Types
Expressions
Keys
Index
Type
Mapping
Counts
Classes
Associations
CWM
157
115
CWMX
130 77
Total
287
192

6. CWM Relational Metamodel (Partial)

7. Transformation General mechanism describing data movement and lineage
X-Form
General mechanism describing data movement and lineage
Generic transformations from any physical object to any other physical object
Maps logical structures and concepts in the warehouse onto physical implementation
Provides for multiple physical implementations of logical structures and concepts
Conceptual Object
Conceptual Object
Mapping
Mapping
X-Form
Logical Object
Logical Object
Mapping
Mapping
Physical Object
Physical Object
X-Form

8. CWM Data Resource Matrix
Intent
Extent
Object
Oriented
Package
Class
Attribute
Extent
Object
Data Value
Relational
Catalog/ Schema
Table
Column
RowSet
Row
Column
Value
Record
RecordFile
RecordDef
Field
RecordSet
Record
Field
Value
Multi- dimensional
Schema
Dimension
Dimensioned
Object
MemberSet
Member
Member
Value
XML
Schema
ElementType
Attribute
Document
Element
Data Value

9. CWM Extension Packages
Extension Techniques
Metamodel specialization
XMI extensions
UML tagged values

10. CWM Package Architecture
org.omg
UML
CWM
Foundation
<<metamodel>> DataTypes
<<metamodel>> TypeMapping
<<metamodel>> KeysIndexes
<<metamodel>> Expressions
<<metamodel>> BusinessInformation
<<metamodel>> SoftwareDeployment
Resource
<<metamodel>> Relational
<<metamodel>> Record
<<metamodel>> Multidimensional
<<metamodel>> XML
Analysis
<<metamodel>> Transformation
<<metamodel>> Olap
<<metamodel>> BusinessNomenclature
<<metamodel>> DataMining
<<metamodel>> InformationVisualization
Management
<<metamodel>> WarehouseProcess
<<metamodel>> WarehouseOperation
CWMX
Modular Design
Minimum dependencies
Cross package services provided by links to UML
Avoid subpackages
Reduced complexity, improved understanding
Use only the packages you need

11. CWM Demo

12. CWM Timeline September 1998 January 1999 November 1999 March 2000
RFI issued
January 1999
First team meeting
November 1999
Initial Submission
Proof of Concept Demo
March 2000
Final Submission
Adoption by OMG Tech Committee & Architecture Board
June 2000
Fax vote ends
Board of Directors vote
September 2000
FTF completes
Interoperability Showcase
Usage Guide
First OMG “Available Specification”?