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
*            object which may be wrapped, such as
	 *            <code>ReportElementModel</code>, <code>ListBandProxy</code>
	 * @return model object
	 */
	public static Object unwrapToModel( Object obj )
	{
		if ( obj instanceof ReportElementModel )
		{
			return ( (ReportElementModel) obj ).getSlotHandle( );
		}
		if ( obj instanceof ListBandProxy )
		{
			return ( (ListBandProxy) obj ).getSlotHandle( );
		}
		return obj;
	}
	/**
	 * Gets the length of elements in object
	 * 
	 * @param obj
	 * @return the length of elements in object
	 */
	public static int getObjectLength( Object obj )
	{
		if ( obj == null )
		{
			return 0;
		}
		else if ( obj instanceof StructuredSelection )
		{