This overview introduces the EGL language as defined in EGL Core and as extended by Eclipse IDE for the EGL Web Developer. Reference details are in the EDT help system, which is made available when you install a download from the following site: www.eclipse.org/edt/download/.
In many ways, EGL is like other programming languages. It includes familiar constructs such as loops and transfers of control. It is built on a set of types, each of which defines the operations that are available for each value of the type. Last, it involves a process for validating source code and for converting the source code into a less abstract form, closer to the runtime need.
Second, stereotypes provide a way to extend the language. The creation of a new kind of stereotype enables an existing source-code element to have an alternative use. For example, a future stereotype might allow a developer to write a custom Handler element and then to create output for a mobile device that runs under the Android operating system. This alternative option requires that the extender create Java classes that add to the existing generator logic.
The mechanism for using stereotypes is provided by EGL Core, which includes the basic rules of EGL syntax. Most stereotypes are provided by an EGL extension, and the first extension is Eclipse IDE for the EGL Developer.
We describe stereotypes in the first of the following pages and proceed to other aspects of the language: