Enterprise Architecture Repository and Model Exchange

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title

Enterprise Architecture Repository and Model Exchange

author

Bernard Szlachta (bs@NobleProg.co.uk)

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Meta Modelling。

Meta-Object Facility (OMG MOF)。

• Originated in UML
• Designed as a four-layered architecture
• It provides a meta-meta model (M3 layer)
• M3-model is the language used by MOF to build metamodels (M2-models, e.g. UML meta-model)
• MOF metamodels are usually modeled as UML class diagrams
• A supporting standard of MOF is XMI (XML-based exchange format for M3,M2 and M1 models)

Common Warehouse Metamodel (OMG CWM) 。

• "Defines a specification for modeling metadata for relational, non-relational, multi-dimensional, and most other objects found in a data warehousing environment"
• Based on UML, MOF, XMI
• Tools can be CWM compliant
• Oracle, Pentaho, IBM support CWM

Since every data management and analysis tool requires different
metadata and a different metadata model (known as a metamodel) 
to solve the data warehouse metadata problem, it is simply 
not possible to have a single metadata repository that 
implements a single metamodel for all the metadata in an organization.
Instead, what is needed is a standard for interchange of warehouse
metadata.
From spec http://www.omg.org/spec/CWM/

XMI。

• The XML Metadata Interchange (XMI)
• Standard for exchanging metadata information via Extensible Markup Language (XML).
• Metadata whose metamodel must be expressed in MOF.
• Usually used for UML, SysML and other MOF compliant languages
• XMI does not exchange the diagram itself (see UMLDI, BPMN 2.0)
• XMI is an ISO standard: ISO/IEC 19503:2005 Information technology

• XMI version 2 is substantially different than XMI 1
• Each metamodel will define their own XMI format, therefore some standards use UML profile rather than their own metamodel (SoaML)