PUTTING XML TO WORK in Java Display Data Matrix in Java PUTTING XML TO WORK

3.5 PUTTING XML TO WORK using jar todevelop data matrix 2d barcode in web,windows application Microsoft .NET XML has alre datamatrix 2d barcode for Java ady become the de facto document standard for exchange of humanreadable data. Whether such will be the case for machine-to-machine communication is questionable; nevertheless, such applications exist and their popularity is increasing. In this chapter, we looked at a variety of XML-based technologies and took an an introductory glimpse at their use in mobile applications.

Then, we looked at RDF, a part of the Semantic Web that is becoming pervasively more crucial to mobile applications. We followed this by discussions of CC/PP and UAProf as. XML: THE DOCUMENT AND METADATA FORMAT applications data matrix barcodes for Java of RDF and XML for mobile applications and nished off the chapter by talking about XML to UML mapping. The signi cance of XML to mobile applications is twofold: First, it offers a well-formed and deterministically modi able format for human-readable data, and second, it offers interoperability. Throughout the remainder of this book, we will focus on building mobile applications that use XML as one of the core pieces in their infrastructure and apply the principles that we learned here in this chapter.

. C HAPTER 4 Introduction to UML David Brady If one has t jsp ECC200 o jump a stream and knows how wide it is, he will not jump. If he does not know how wide it is, he will jump, and six times out of ten he will make it. Persian Proverb.

4.1 INTRODUCTION The uni ed m data matrix barcodes for Java odeling language (UML) is a standardized language for modeling software systems. Although small systems are easy for a single person or a small group to comprehend and develop, large systems are more dif cult to design successfully, because there are often many people and entities controlling different aspects of the system and de ning how they should work from their own professional specialty or prerogative. For example, a large company requesting a new piece of software might assign the job to a project manager who has a thorough understanding of the overall system requirements, whereas a software developer assigned to work on the system is likely to care more about the ways that individual portions of a system work on a detailed level and less about the practical requirements of users and management.

Similarly, an end user of the system is likely to care about how the user interface is organized and that the software is built to facilitate ease of use for everyday users, rather than that a particular software component was designed exquisitely or that the project ful lls the stated requirements that its originator decided on. The process of building software can be very complex, and, moreover, there are few cases where a single person has full comprehension of how a system should be designed to ful ll all of its requirements. Designing a system that takes into consideration all of the different requirements for the system, from the viewpoint of its stakeholders, developers, users, domain experts, and others, and which still can adapt to change readily and without causing unforeseen problems is next to impossible without de ning the system in a manner that illustrates the various facets of a system, but still recognizing a common set.

INTRODUCTION TO UML of entities DataMatrix for Java between those facets. If you have used UML in your projects as a developer and have a fair understanding of the underlying concepts of UML, you can skip this chapter and move on to the next. This chapter will serve as a very basic introduction to UML.

Many details of UML are missing here, but we have gathered a basic introduction that should suf ce for our purposes. Let us rst take the case of stationary applications and then we will extend it to mobile applications. The problem for typical software applications is twofold: First, systems are dif cult to manage conceptually.

By providing different diagrams that illuminate differing views of a system, UML allows a system to be seen piece by piece in consistent pieces, which, together, give a complete view of the system. Second, with multiple people working with a microcosmic view of a system, one person s change can have an impact on aspects of the system that are unknown to the others. Because the UML uses common elements in the different diagrams, it becomes much easier to see the rami cations of a change throughout a system.

During the development process, team members often let their individual goals take priority over the project at the expense of the business goals for which it was designed. Their misguided targets are often caused by an adherence to outdated requirements and their inaccurate interpretation of them. So keeping a model synchronized with the requirements that are being de ned while maintaining accuracy becomes of the utmost importance.

The solution to the problem leads us to modeling. Because modeling helps the design phase so signi cantly, a byproduct is often reduced costs of the system. Furthermore, it is an effective way to ensure at the outset that a system can be built, that the costs of doing so are not unreasonable, and that the system will ful ll the business requirements and meet the needs of its users.

Modeling is not unique to software. It is used in a variety of disciplines to think through a system or product, describe it, and discover design aws before it is built. Modeling is used in architecture, in mathematics, in the sciences (seismology is a good example), in civil engineering, in auto manufacturing, and in an almost in nite number of things that are conceptually complex and bene t from a modeling illustration of the problem at hand, its ability to encourage understanding of its parts, and the facilitation of communication among the people involved.

You can think of the model as a blueprint of the software system to be built. A model should include different perspectives of the system from the viewpoints of the various team members, such as developers, end users, and the entity that determined the need for the system and instigated its development. The UML provides different views based on who is interpreting the model and in what way.

What the UML provides in a nutshell, then, is a manner of modeling software that provides a full range of views, from very general overviews of how the system works as a whole, to detailed interactions and descriptions of how each object functions and communicates. Modeling a software system has many bene ts and goals. First, modeling helps people to visualize a system as they want it to be.

It provides a template for constructing the system, which speci es details of system implementation in a speci c enough way that software developers can implement it rapidly and with fewer work stoppages to clarify requirements. By separating system development.
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