5.29日 自己程序的编写，目的：生成xml文件

public interface XmlModel {    
    public void initModel();    
    public void doSaveXML();
}

package hellogef.model;

import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;

import org.eclipse.ui.views.properties.IPropertySource;

public abstract class AbstractModel implements IPropertySource,XmlModel{
    
    private PropertyChangeSupport listeners = new PropertyChangeSupport(this);    
    

    public void addPropertyChangeListener(PropertyChangeListener listener){
        listeners.addPropertyChangeListener(listener);
    }
    
    public void firePropertyChange(String propertyName,Object oldValue,Object newValue){
        listeners.firePropertyChange(propertyName, oldValue, newValue);
    }
    
    public void removePropertyChangeListener(PropertyChangeListener listener){
        listeners.removePropertyChangeListener(listener);
    }    
    
    protected void fireStructureChange(String prop, Object child) {
        listeners.firePropertyChange(prop, null, child);
    }

}

<diagram>
       <figure>
             <startnode>
                     <name>start</name>
                     <!—ID应该是随机生成的吧，假设是5-->
                     <ID> 5</ID> 
                     <connectionpoint>
                           <x>2.5</x>
                           <y>3.5</y>
                     </connectionpoint>
                     <!--怎么表示图形呢？-->
                     <startfigure></startfigure>???
              </startnode>
              <movenode>
                     <name>start</name>
                     <ID> 2</ID> 
                     <connectionpoint>
                           <x>2.5</x>
                           <y>3.5</y>
                     </connectionpoint>
                     <movefigure></movefigure>
                     <velocity>30</velocity>
                     <displacement>10</displacement>
              </movenode>
              <connection>
                     <from>5</from>
                     <to>2</to>
              </connection>

              <connection>
                     <from>2</from>
                     <to>6</to>
              </connection>

              <stopnode>
                     <name>stop</name>
                     <ID>6<ID>
                     <connectionpoint>
                         <x>10.5</x>
                         <y>20</y>
                     </connectionpoint>
                     <stopfigure></stopfure>
              </stopnode>
       </figure>
</diagram>