Bug 119331 Library - name space terminology and behavior
During BIRT 2.0 library feature review meeting the following change was decided. - Change the term namespace to 'prefix' - By default use the library name as the prefix ( namespace ); the dialog to input prefix should be prompted only if hte auto generated prefix is not unique.
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/core/commands/CreateCommand.java
* not executable.
	 */
	public void execute( )
	{
		DesignElementHandle newObject = (DesignElementHandle) extendsData.get( DesignerConstants.KEY_NEWOBJECT );
		if ( DesignerConstants.TRACING_COMMANDS )
		{
			System.out.println( "CreateCommand >> Starts ... " ); 
		}
		try
		{
			
			if ( parent instanceof SlotHandle )
			{
				if ( after != null )
				{
					int pos = DEUtil.findInsertPosition( ( (SlotHandle) parent ).getElementHandle( ),
							(DesignElementHandle) after,
							( (SlotHandle) parent ).getSlotID( ) );
					( (SlotHandle) parent ).add( newObject, pos );
				}
				else
				{
					( (SlotHandle) parent ).add( newObject );
				}
			}
			else
			{
				
				if ( after != null )