This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages) This article includes a list of general references, but it lacks sufficient corresponding inline citations. Please help to improve this article by introducing more precise citations. (April 2009) (Learn how and when to remove this template message) This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: "XML Metadata Interchange" – news · newspapers · books · scholar · JSTOR (September 2014) (Learn how and when to remove this template message) (Learn how and when to remove this template message)
Filename extension
Internet media type
Type codeTEXT
Developed byObject Management Group
Latest release
June 2015; 7 years ago (2015-06)
Type of formatMarkup language
Extended fromXML
StandardMOF 2 XMI Mapping
Open format?yes

The XML Metadata Interchange (XMI) is an Object Management Group (OMG) standard for exchanging metadata information via Extensible Markup Language (XML).

It can be used for any metadata whose metamodel can be expressed in Meta-Object Facility (MOF).

The most common use of XMI is as an interchange format for UML models, although it can also be used for serialization of models of other languages (metamodels).


In the OMG vision of modeling, data is split into abstract models and concrete models. The abstract models represent the semantic information, whereas the concrete models represent visual diagrams. Abstract models are instances of arbitrary MOF-based modeling languages such as UML or SysML. For diagrams, the Diagram Interchange (DI, XMI[DI]) standard is used. There are currently several incompatibilities between different modeling tool vendor implementations of XMI, even between interchange of abstract model data. The usage of Diagram Interchange is almost nonexistent. This means exchanging files between UML modeling tools using XMI is rarely possible.

One purpose of XML Metadata Interchange (XMI) is to enable easy interchange of metadata between UML-based modeling tools and MOF-based metadata repositories in distributed heterogeneous environments. XMI is also commonly used as the medium by which models are passed from modeling tools to software generation tools as part of model-driven engineering.

Examples of XMI, and lists of the XML tags that make up XMI-formatted files, are available in the version 2.5.1 specification document.[1]

Integration of industry standards

XMI integrates 4 industry standards:

The integration of these 4 standards into XMI allows tool developers of distributed systems to share object models and other metadata.

Several versions of XMI have been created: 1.0, 1.1, 1.2, 2.0, 2.1, 2.1.1, 2.4, 2.4.1, 2.4.2. and 2 5.1. The 2.x versions are radically different from the 1.x series.

Version Release date URL
2.5.1 June 2015
2.4.2 April 2014
2.4.1 August 2011
2.4 March 2011
2.1.1 December 2007
2.1 September 2005

There are other XML standards for representing metadata, such as the Web Ontology Language (OWL), but OWL does not have built-in support for most of the information represented in UML.

The Diagram Definition OMG project is another alternative, which can also express the layout and graphical representation.[2]

XMI is an international standard:

XMI 2.4.2
ISO/IEC 19509:2014 Information technology — XML Metadata Interchange (XMI)
XMI 2.0
ISO/IEC 19503:2005 Information technology — XML Metadata Interchange (XMI)

See also


  1. ^ Object Management Group. XML Metadata Interchange (XMI) Specification, version 2.5.1, June 2015
  2. ^ OMG (2012-07-01). "Diagram Definition, Version 1.0". Retrieved 2013-02-21.