MDA Distilled: Principles of Model-Driven Architecture by Kendall Scott, Axel Uhl, Dirk Weise Stephen J. Mellor

By Kendall Scott, Axel Uhl, Dirk Weise Stephen J. Mellor

As platforms have grown extra the most important to the operations of businesses world wide, so too have the prices linked to construction and holding them. input model-driven structure (MDA), a regular framework from the item administration workforce (OMG) that enables builders to hyperlink item versions jointly to construct entire platforms. MDA prevents layout judgements from being intertwined with the applying and retains it self reliant of its implementation. the result's an software that may be mixed with different applied sciences in addition to different purposes, and versions that turn into hugely reusable resources.

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Day Day Up > < Day Day Up > Merging Mappings for Weaving A function takes one or more input values and produces an output value. For example, the square root function takes a set of real numbers or integers say, {25, 16, 9} and generates a different set of real numbers or integers in this case, {5, 4, 3}. Such a mapping can be stated as a rule (in other words, what we normally think of as a function), or as an enumeration {25:5, 16:4, 9:3}. This abstruse factoid applies equally to mapping functions.

Day Day Up > < Day Day Up > Chapter 6. Building Marking Models In Chapter 5, we observed that mapping functions alone are not always sufficient to transform a source model completely, because we may not be able to select the correct mapping rule based solely on the information contained in the source model and we may need additional inputs to perform the mapping. These additional inputs are provided as marks, which are lightweight, non-intrusive extensions to models that capture information required for model transformation without polluting those models.

41 42 Nonetheless, the M3 level is a model of only the simplest set of concepts required to capture models and metamodels. M3 stands out as a constant in the modeling business. That's why there have been some efforts in standardizing things at this level, which has given us the MOF. < Day Day Up > < Day Day Up > MOF: A Standard For Metamodeling The MOF defines a set of modeling constructs that a modeler can use to define and manipulate a set of interoperable metamodels. The MOF resides at the bottom (M3) level of the four-tier metamodel architecture.

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