With the rise of model-driven development, model repositories are intended to facilitate research in model engineering and consequently in domain-specific modeling. Model repositories are central places where all kinds of modeling artifacts (e.g., meta-metamodels, metamodels, models, and possibly transformation models) are stored and coordinated. They can serve as a platform for making available the specification of metamodels to others (typically necessary for domain-specific modeling languages) and for exchanging models, as well as a resource for teaching/learning materials.
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This tutorial covers the main packages in the Spring Framework. For full details, we refer you to Rod Johnson’s book, Expert One-on-One J2EE Design and Development, published by Wrox Press in 2002. The book’s ISBN number is 1-86100-784-1. The code for the Spring Framework is contained in package com.interface21. We provide UML diagrams for the subpackages, as well as code samples.
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C# is a modern object-oriented language for application development. In addition to object-oriented constructs, C# supports component-oriented programming with properties, methods and events.

UML defines graphical notations for describing and designing object-oriented software systems. It’s an open standard controlled by the Object Management Group (OMG). Although UML has many diagram types, we’ll focus on class models that show static class structure and relationships.
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