science

XML Metadata Interchange

XML Metadata Interchange is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand XML Metadata Interchange rather than just read about it. In short: 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), a platform-independent model (PIM).

Key takeaways

XML Metadata Interchange belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect XML Metadata Interchange to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of XML Metadata Interchange from memory before moving on to harder problems.

Reference excerpt

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), a platform-independent model (PIM). 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).

Overview 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.

Integration of industry standards XMI integrates 4 industry standards:

XML – Extensible Markup Language, a W3C standard. UML – Unified Modeling Language, an OMG modeling standard. MOF – Meta Object Facility, an OMG language for specifying metamodels. MOF – Mapping to XMI 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.

The Diagram Definition OMG project is another alternative for metadata interchange, which can also express the layout and graphical representation. 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 Common Warehouse Metamodel Web Ontology Language Generic Modeling Environment (GME) Eclipse Modeling Framework (EMF) Domain Specific Language (DSL) Domain-specific modelling (DSM) Meta-modeling Meta-Object Facility (MOF)

References

External links OMG XMI Specification

Worked examples

Example 1 — a first encounter with XML Metadata Interchange

Start with the simplest possible case. Write down what XML Metadata Interchange claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to XML Metadata Interchange before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about XML Metadata Interchange ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of XML Metadata Interchange

In research: XML Metadata Interchange appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses XML Metadata Interchange in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: XML Metadata Interchange is common in secondary-school and first-year university syllabi. It links to neighbouring topics ISO standards, Systems Modeling Language, Unified Modeling Language, so understanding it makes those chapters shorter.
In everyday life: Look for XML Metadata Interchange outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study XML Metadata Interchange in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what XML Metadata Interchange means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain XML Metadata Interchange out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is XML Metadata Interchange in simple terms?

Why does XML Metadata Interchange matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study XML Metadata Interchange?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on XML Metadata Interchange.