By James Rumbaugh

The authors have performed an exceptional activity with this UML publication. The definitions of the phrases are the easiest i've got obvious. The association and fabric within the encyclopedia are fantastic!-Perry Cole, MCIWorldComThe Unified Modeling Language (UML) has quickly develop into the traditional notation for modeling software-intensive platforms. This e-book presents the definitive description of UML from its unique builders - James Rumbaugh, Ivar Jacobson, and Grady Booch. even if you're taking pictures requisites, constructing a software program structure, designing the implementation, or attempting to comprehend an present process, this is often the booklet for you.The majority of the ebook is a different alphabetical record of articles masking each point of UML in a sort handy for fast reference and specific examine. This layout allows complete insurance of UML info in addition to high-level articles with out complicated the reader via consistent shifts in point. the 1st a part of the publication - a whole precis of UML innovations equipped by means of topic sector - offers an creation to UML for the newcomer in addition to access issues into the unique articles.

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Models are descriptions. The things they describe are instances, which usually appear in models only as examples. Most instances exist only as part of the run-time execution. Sometimes, however, run-time instances are themselves descriptions of other things. We call these hybrid objects metadata. Looked at more deeply, it is unrealistic to insist that everything is either an instance or a description. Something is an instance or a description not in isolation but only in relation to something else, and most things can be approached from multiple viewpoints.

Reservations are of two kinds: subscription series and individual reservations. Both reserve tickets: in one case, only one ticket; in the other case, several tickets. Every ticket is part of a subscription series or an individual reservation, but not both. Every performance has many tickets available, each with a unique seat number. A performance can be identified by a show, date, and time. Classes can be described at various levels of precision and concreteness. In the early stages of design, the model captures the more logical aspects of the problem.

Abstraction versus detail. A model captures the essential aspects of a system and ignores others. Which ones are essential is a matter of judgment that depends on the purpose of the model. This is not a dichotomy; there may be a spectrum of models of increasing precision. A modeling language is not a programming language. A modeling language may permit models to be specified at various levels 22 Part 1 • Background of detail. An early model or a high-level model may not require full detail, because additional detail may be irrelevant for the purpose at hand.

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