### Introduction

This document describes how you can use scripts to generate code from XML Schema (xsd) files. The script can be either a regular shell script that invokes Eclipse headless applications or an Ant script that invokes the task provided by this plugin.

### Overall Comments

- Before running your build scripts or the examples provided here, make sure you have the 2 jar files required by this plugin ("xsd.ecore.importer.jar" and "xsd.ecore.importer.tasks.jar") and also the 2 jar files required by the `org.eclipse.emf.ant` plugin ("emf.ant.jar" and "emf.ant.tasks.jar"). If necessary, Eclipse can generate them for you. All you need to do is to run the Ant script created by PDE when you right click on the manifest file and select "PDE Tools>Create Ant Build File".
- Although the applications and task mentioned here must be executed by Eclipse (usually in headless mode), they can work on files located in any directory. In other words, your models, templates and other files don't need to be in the "plugins" directory nor in the workspace.
- In order to preserve the original state of this plugin's "examples" directory, you should copy it to a different location and run the Ant scripts from there.
- Starting a new JVM process and invoking Eclipse are expensive operations. Your build will perform better if you are able to group the steps that require Eclipse in a few scripts (one script would be ideal). This is probably a reason to use Ant instead of invoking the applications - you can generate code for multiple models using one single Ant script.
- The "examples/library" directory contains xsd file, and shell and Ant scripts to generate their code.

### XSD and Generator Applications

The application provided by this plugin generates the ecore and genmodel files from models defined using XSD files.

XSD application details
ID | `org.eclipse.xsd.ecore.importer.XSD2GenModel`
Class | `org.eclipse.xsd.ecore.importer.XSDImporterApplication`

To generate the actual Java code you will need to use a second application, provided by the "org.eclipse.emf.codegen.ecore" plugin.

Generator application details
ID | `org.eclipse.emf.codegen.ecore.Generator`
Class | `org.eclipse.emf.codegen.ecore.Generator`

In order to run these or any other Eclipse application, you need to execute the following command (without the line breaks):

java
-classpath <eclipseDir>/startup.jar org.eclipse.core.launcher.Main
-data <full path to a workspace - ideally an empty directory>
-application <application ID>
<application arguments>

The directory "examples/library/build" has shell scripts that generate the code for the model provided. If you have any questions after reading and experimenting with it, look at the applications's javadoc for more details. Also, check the application's class "getUsage()" method for the list of possible arguments.

### XSD Ant Task

The XSD task details are:

Name | `emf.XSD2Java`
Class | `org.eclipse.xsd.ecore.importer.taskdefs.XSDGeneratorTask`

This is the usual command line to run an Ant script using a headless Eclipse instance (remove the line breaks):

java
-classpath <eclipseDir>/startup.jar org.eclipse.core.launcher.Main
-data <full path to a workspace - ideally an empty directory>
-application org.eclipse.ant.core.antRunner
-buildfile <full path to your script>

The directory "examples/library/build" has an Ant script that generate the code for the model provided. The task's javadoc has lots of information you may find useful.