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An Interactive Introduction to GCE

One of the GRAIL development environments that is available is known as the GCE (GALEN Case Environment), which is part of ClaW (Classification Workbench). A time-limited version can be downloaded at Kermanog. This pre-tutorial will provide you with enough of a starting point to progress with the tutorial.

Accessing the Tools

In the environment you will be using, GCE communicates with a ROIS implementation of a GALEN Terminology Server. When the environment starts (consult your local installation guide or technical support for details of this if you have difficulties), you will see GCE, where you can browse your GALEN models, and from which you can start the Workspace.

Creating a new model

The primary way of creating a model is via the GRAIL compiler. GRAIL expressions can be typed into a ‘workspace’ - a scratch area for compiling GRAIL expressions, or a file editor.

As a first start, open GCE and create a new model via File-New. Now start the Workspace and type the text as shown in the screen-dump below. This GRAIL source is evaluated, or compiled, by pressing the Compile button. In other words, the GRAIL expressions you have entered are parsed into individual calls to the Terminology Server; they are then passed to the server and cause the GRAIL engine within the server to extend the model.

This is a super-simple model - all we have said is that there is a notion of an Ant, which is a kind of Insect, which is, in turn, a kind of Animal. This is just to introduce you to the tools.

Viewing the model

GCE shows the hierarchical structure of the concept of interest (the browser’s ‘focus’), as well as other properties that may apply to the focus. In this example, you’re seeing the model generated from the two GRAIL statements in 2.3.2.

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