The following plugin is an example. It is used in <oXygen/> for capitalizing the characters in the current selection. This example consist of two classes and the plugin descriptor:

package ro.sync.sample.plugin.uppercase;

import ro.sync.exml.plugin.Plugin;
import ro.sync.exml.plugin.PluginDescriptor;

public class UppercasePlugin extends Plugin {
    /**
    * Plugin instance.
    */
    private static UppercasePlugin instance = null;  
    
    /**
    * UppercasePlugin constructor.
    * 
    * @param descriptor Plugin descriptor object.
    */
    public UppercasePlugin(PluginDescriptor descriptor) {
        super(descriptor);
    
        if (instance != null) {
            throw new IllegalStateException("Already instantiated !");
        }    
        instance = this;
    }
    
    /**
    * Get the plugin instance.
    * 
    * @return the shared plugin instance.
    */
    public static UppercasePlugin getInstance() {
        return instance;
    }
}
            

package ro.sync.sample.plugin.uppercase;

import ro.sync.exml.plugin.selection.SelectionPluginContext;
import ro.sync.exml.plugin.selection.SelectionPluginExtension;
import ro.sync.exml.plugin.selection.SelectionPluginResult;
import ro.sync.exml.plugin.selection.SelectionPluginResultImpl;

public class UppercasePluginExtension implements SelectionPluginExtension {
    /**
    * Convert the text to uppercase.
    *
    *@param  context  Selection context.
    *@return          Uppercase plugin result.
    */
    public SelectionPluginResult process(SelectionPluginContext context) {
        return new SelectionPluginResultImpl(
            context.getSelection().toUpperCase());
    }
}
            

<!DOCTYPE plugin SYSTEM "../plugin.dtd">
<plugin
    name="UpperCase"
    description="Convert the selection to uppercase"
    version="1.0.0"
    vendor="SyncRO"
    class="ro.sync.sample.plugin.uppercase.UppercasePlugin">
    <runtime>
        <library name="lib/uppercase.jar"/>
    </runtime>
    <extension type="selectionProcessor" 
     class="ro.sync.sample.plugin.uppercase.UppercasePluginExtension"/>
</plugin>