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What is the Common Warehouse Metamodel (CWM)?

What is CWM? Here you find a short explanation of what it's all about.


The purpose of OMG? Common Warehouse Metadata Initiative (CWMI) is to enable easy interchange of metadata between data warehousing tools and metadata repositories in distributed heterogeneous environments. 

The CWM team

In response to OMG? CWMI RFP, the following companies

  • IBM
  • Unisys
  • NCR
  • Hyperion
  • Oracle
  • UBS AG
  • Genesis Development Corporation
  • Dimension EDI 

created the Common Warehouse Metamodel (CWM). The submission is also supported by Deere & Company and Sun Microsystems.

Metadata modeling

The Common Warehouse Metamodel is a specification for modeling metadata for relational, non-relational, multidimensional systems, and most other objects found in a data warehousing environment. 

Tracing lineage of data

In addition, CWM models enable users to trace the lineage of data CWM provides objects that describe where the data came from and when and how the data was created.

XML Metadata Interchange

Instances of the metamodel are exchanged via XMI (XML Metadata Interchange) documents. 

The ultimate goal of CWM is to do for data warehousing and business intelligence tools what HTML did for web browsers.

 More information
Here you find links to the original RFP, the CWM specification and related documents.
FAQ Frequently Asked Questions about CWM.
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