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/util/DNDUtil.java
{
		int position = -1;
		if ( canContain == CONTAIN_PARENT )
		{
			DesignElementHandle afterHandle = getDesignElementHandle( targetObj );
			if ( afterHandle != null )
			{
				position = afterHandle.getContainerSlotHandle( )
						.findPosn( afterHandle );
				position++;
			}
		}
		return position;
	}
	/**
	 * Adds new object to container
	 * 
	 * @param container
	 *            container, not null
	 * @param handle
	 *            new object. If new object is null, create nothing
	 * @throws SemanticException
	 */
	public static void addElementHandle( Object container,
			DesignElementHandle handle ) throws SemanticException
	{
		assert ( container != null );
		if ( handle == null )
		{
			return;