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By Keng Siau

Complex issues in Database study is a chain of books at the fields of database, software program engineering, and structures research and layout. They characteristic the most recent learn rules and subject matters on the way to improve present database platforms, enhance info garage, refine latest database types, and improve complicated purposes. complex themes in Database study, quantity five is part of this sequence. complicated issues in Database study, quantity five offers the newest learn rules and subject matters on database platforms and purposes, and offers insights into vital advancements within the box of database and database administration. This e-book describes the features and lines of latest applied sciences and methodologies, and provides cutting-edge examine principles, with an emphasis on theoretical concerns relating to databases and database administration.

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In the following, we describe how to translate basic specification in NEREUS to CASL, and then analyze how to translate associations (Favre, 2005b). Translating Basic Specifications In NEREUS, the elements of are pairs C1:C2 where C1 is the formal generic parameter constrained by an existing class C2 or C1: ANY (see Figure 2). In CASL, the first syntax is translated into [C2] and the second in [sort C1] . Figure 15 shows some examples. NEREUS and CASL have a similar syntax for declaring types.

The document representing Model A consisted of 174,445 lines of XMI code, that for Model B 36,828 lines. com). Export from Model B was found to be valid, but that from Model A was not. Both validation tools stated that the exported XMI document for Model A had a structure that deviated from the standard specified by OMG. The problem related to non-conformance with an ordering dependency in the XMI DTD. This was repaired manually in order to allow tests to continue. Such repair is extremely difficult without specialised tool support because the file consists of 174,445 lines of XMI code, which in any case is very difficult for a human reader to comprehend.

All of this heightens the company’s interest in model interchange between tools, and XMI is currently the most commonly supported open-data standard. It can be noted that OMG describes XMI as a general interchange standard and does not, in this respect, distinguish between different XMI versions, stating that “XMI allows metadata to be interchanged as streams or files with a standard format based on XML” (OMG, 2000a). This raises the question of whether XMI should actually be referred to as a standard interchange format.

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