We study the problem of how to define the concrete syntax of a modeling language based on the standards proposed by the Object Management Group (OMG). The OMG has recently published the Diagram Interchange (XMI[DI]) standard that contains a language to describe the graphical representation of a model. XMI[DI] is required to enableinteroperability between modeling tools. However, XMI[DI] can onl...

We’re changing gears in this column. Our recent columns have used a distributed stock quoting example to focus on different concurrency models for developing multithreaded server applications. In this column, we’ll start looking at another aspect of distributed object computing systems: decoupling the relationship between “clients” and “servers.” Our examples to date have focused exclusively on...

There is widespread agreement in the object community that the concept of role is important for object modelling, but there is little agreement about what is to be understood by " a role. " In a recent survey paper, Friedrich Steimann shows that the academics are very divided on this topic [12]. Standard bodies are also facing the issue of finding a proper definition for the concept of role. In...

The MDD (Model Driven Development) initiative covers a broad spectrum of research areas such as modeling languages, definition of transformation languages among models, and construction of support tools. Currently, some of these aspects are being established and applied, while others are still in the process of definition. Consequently, it is necessary to make every effort to convert MDD and it...

This short paper presents the design, implementation, and initial results of a tool that extracts from UML models the schedulability analysis data that are necessary for the application of the MAST set of tools on them. The input analysis models represent concurrent, distributed real-time systems that are formalized in UML annotated with the extensions proposed by the UML Profile for MARTE; the...

We’re changing gears in this column. Our recent columns have used a distributed stock quoting example to focus on different concurrency models for developing multithreaded server applications. In this column, we’ll start looking at another aspect of distributed object computing systems: decoupling the relationship between “clients” and “servers.” Our examples to date have focused exclusively on...

Object-oriented modeling is used in a growing number of commercial software development projects. But the plethora of approaches and corresponding CASE tools still prevents corporate users from migrating to object-oriented software development methods. Against this background the recent efforts of the Object Management Group (OMG) to standardize object-oriented modeling languages seem to promis...

The Object Management Group (OMG) is pursuing its new Model-Driven Architecture (MDA) strategy. The Meta-Object Facility (MOF) is an important technology to support the MDA, both as a general modelling technique but also specifically to support the definition of other modelling systems. The OMG has standardised the generation of repositories based on MOF models. Anti-Yacc is a tool that can be ...

This paper is targeted for input to the new OMG Agent Special Interest Group and describes a way how to integrate object mobility into a CORBA environment. The studies on which this paper is based are currently performed in the context of Mobile Agent Technology (MAT). However, since just the mobility aspect is handled (and not autonomy which is the only commonly agreed characteristic of a soft...

Cultivation and commercialization of Capsicum pepper have great importance in Brazil. This work assessed the influence omission macro micronutrients on growth mineral nutrition sweet plants (Capsicum chinense Jacquin). The research was carried out a greenhouse with washed sand as substrate. experimental design completely randomized five replications eight treatments: complete (control), N, P, K...