Welcome
Developing
Developing EGL applications
Enterprise Generation Language (EGL) is a programming language that you can use to focus on business problems instead of software technologies. Within the Rational® development environment, you can use EGL wizards and other tools to write complex applications with minimal effort.
EGL Language Reference
The EGL Language Reference covers the fundamental use of the language, including its concepts, syntax, and keywords. This volume is intended for a developer writing EGL applications with some experience in procedural programming.
Logic parts
Program part
A program part defines the central logic in a runtime program.
Program properties
v60ExceptionCompatibility

Overview
Getting started
Installing
Upgrading and migrating
EGL Code Accelerator for IBD
Developing
- Model driven development of EGL code
- Generating source code from UML models
  You can use transformations to create source code from a UML model. First you must create a transformation parameters file and then apply those parameters to a model.
- Generating the EGL Dependency Graph from EGL projects
- Generating Source Code from OpenAPI Documents
- Developing EGL applications
  Enterprise Generation Language (EGL) is a programming language that you can use to focus on business problems instead of software technologies. Within the Rational® development environment, you can use EGL wizards and other tools to write complex applications with minimal effort.
  - How to use this documentation
  - Additional information about EGL
    The most recent EGL documentation is in the IBM Business Developer documentation.
  - EGL Programmer's Guide
    The EGL Programmer's Guide covers using EGL within the Eclipse Integrated Development Environment (IDE), as well as some of the common programming tasks that EGL developers perform.
  - EGL Generation Guide
    The EGL Generation Guide covers the process of converting EGL code to Java™ or COBOL source code, including the processes and the files involved. This section is intended for a developer who will generate or deploy EGL applications.
  - EGL Language Reference
    The EGL Language Reference covers the fundamental use of the language, including its concepts, syntax, and keywords. This volume is intended for a developer writing EGL applications with some experience in procedural programming.
    - General syntax
    - System data parts
    - User-defined data parts
    - Logic parts
      - Functions
      - Program part
        A program part defines the central logic in a runtime program.
        Program properties
        alias
        allowUnqualifiedItemReferences
        handleHardIOErrors
        i4glItemsNullable
        includeReferencedFunctions
        inputRecord
        msgTablePrefix
        throwNrfEofExceptions
        unloadOnExit
        The unloadOnExit property specifies whether to unload a called program after it ends. The valid values are YES or NO.
        v60ExceptionCompatibility
      - Library part
        Library parts support the sharing of functions and variables.
      - Service part reference
        Service parts provide requesters with access to the functions in the service. A requester can be a local or remote program, handler, library, or another service.
      - Interface part
        Interface parts provide access to a remote service, such as a web service.
      - ExternalType part
        ExternalType parts map EGL to external language elements.
      - Delegate part
        Delegate parts provide models for functions.
      - Stand-alone function part
        Stand-alone function parts support migration from languages that do not use libraries.
    - Correspondence between a JSON string and an EGL variable
      This topic describes the EGL record that corresponds to a JavaScript™ Object Notation (JSON) string. Other topics describe the functions (serviceLib.convertFromJSON() and serviceLib.convertToJSON()) that are used by a Rich UI developer to convert JSON data to or from a variable, as may be necessary to access a third-party REST service. A failure in either function causes a RuntimeException.
    - Correspondence between a JSON string and an EGL variable for zOS and IBM i
      This topic describes the EGL record that corresponds to a JavaScript Object Notation (JSON) string. This topic describes the functions—serviceLib.convertFromJSON() and serviceLib.convertToJSON()—that are used by an EGL developer to convert JSON data to or from a variable either for zOS or IBM i systems. A failure in either function causes a RuntimeException.
    - Special considerations for JSON support on IBM i:
    - Correspondence between an XML string and an EGL variable
      This topic describes the EGL record that corresponds to an Extensible Markup Language (XML) string. Other topics describe the functions (serviceLib.convertFromXML and serviceLib.convertToXML) that are used by a Rich UI developer to convert XML data to or from a variable, as may be necessary to access a third-party REST service.
    - EGL statements
    - EGL core system libraries and variables
    - Accessing data in EGL
      Whenever you access a data store in EGL, the data goes into a record.
    - Applications with user interfaces
    - VisualAge® Generator compatibility
    - Appendices
    - Importing product-supplied projects
      You can click a link to download the current version of Rich UI projects. The capability is useful if you deleted a project or want a clean version.
  - Rational® COBOL Runtime Guide for zSeries®
    This manual provides information about customizing and administering the IBM® Rational® COBOL Runtime.
  - IBM Business Developer EGL Server Guide for IBM® i
    This manual provides information about customizing and administering EGL Server for IBM® i on the host.
  - Generation for VSE Feature Reference
    This reference manual provides z/VSE-specific information about developing and generating EGL programs in the VSE environment.
- Source code analysis with code review
  With code review, you can create configurations of coding rules for EGL source code. You can then run the configurations to check the source code for consistency with the rules.
- Responsive Design Support in IBD
  What is Responsive Design? Responsive design is an approach for creation of web pages that automatically scales its content and elements to match the screen size on which it is viewed. So, instead of designing multiple websites for different devices with variable screen sizes, we can design just one website that scales up or down automatically, to match the device it’s being viewed on.
- Containerizing an EGL RUI Application
Samples
Troubleshooting and support
EGL runtime error messages
Reference
Glossary
Using the help
Notices for IBM Business Developer documentation

v60ExceptionCompatibility

If the v60ExceptionCompatibility property is set to YES, it has the following effects:

You can have only a single onException block within a try block, and you cannot specify an exception type.
You can use the sysLib.currentException variable to determine the nature of the problem. This variable is only available in V6 compatibility mode.
Exceptions do not propagate beyond the part in which they occur, for example, if an error occurs within a function called by a try block, the try block never receives an indication that the exception was thrown.
Hard I/O errors terminate the application unless you set the handleHardIOErrors program property to YES. In that case, EGL throws an exception so the program can handle the hard I/O error itself.
You cannot throw your own exceptions.

EGL sets v60ExceptionCompatibility to YES automatically when migrating code from EGL version 6 or VisualAge® Generator. You do not need this property for new code. You can set this property to different values in different programs within a run unit, but this practice can cause errors.

Compatibility

Table 1. Compatibility considerations for v60ExceptionCompatibility property
Platform	Issue
COBOL generation	If the v60ExceptionCompatibility property is set to YES, unhandled exceptions will display the error panel like version 6 did. If this property is set to NO, an ELAX abend is displayed and the messages are written to the ELAD queue.