XML messaging become more and more popular as system(web) integration tool, I recently wrote some small programs (running in CICS 1.3 on os/390 & z/os), the program will accept XML request message(over HTTP) from client (like IE browser, java application, EJB in container, etc) , parse the XML message, invoke the transaction ID specified in the XML request in a CICS bridge facility, intercept the ADS (Application datastructure which actually points to the working storage of the MAP copybook) data, translate the data into the XML format and send back the response XML message to the client. The client can send another XML message based on the content of the response XML received.
There is no 3270 screen-scraping approach used in the program, the response time is very fast. you can download the obj code from the website and link-edit them into load modules in your TSO, the install.txt gives you a simple procedure on how to define the necessary CICS resources in order to use it.
I also wrote a GUI client software in Java, you can use this client software to invoke any of the CICS transations on your mainframe without any change to your existing application. source code are available for download.
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