CWM: A Model-based Architecture For Data Warehouse Interchange Doug Tolbert Pacific Development Lab Unisys Corporation Mission Viejo, CA doug.tolbert@unisys.com

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

The CWM Metamodel

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

(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

CWM Relational Metamodel (Partial)

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

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

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

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

CWM Demo

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”?