...support the application XML in this field:

* The penetration of the Internet and intranets in manufacturing processes

* The need to use a standard, nonproprietary format for data exchange

* Interconnection between business information and process control systems

This article describes an XML-based system used for monitoring air quality at Tuzla Canton, Bosnia-Herzegovina. The system includes measurement stations at different locations, as shown in Figure I.

After user analysis and discussions with the client, the Cantonal Environmental Protection Agency at Tuzla, the decision was made not to use the routine solution to the problem, the SCADA (supervisory control and data acquisition) system. The main arguments for this decision were that the SCADA system has a multi dimension structure, and several features would be not used in this application. In addition, the price for SCADA would be significantly higher and developing the SCADA application would take longer than developing a solution using open source resources. Another advantage of this approach is that it's easier to make custom-designed applications than to work with SCUDA, which isn't so flexible.

Several measurement stations collect air quality data, which must be processed and stored in local systems and sent to the central computer where it is processed and stored in a database. If alarm messages are sent, the corresponding activity is performed. The data stored in the archive can he analyzed and shown to users--clients on the intranet who can demand different reports that are available fur different...

NOTE: All illustrations and photos have been removed from this article.



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