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
}
				return false;
			}
			for ( int i = 0; i < array.length; i++ )
			{
				if ( checkContainerExists( array[i], array ) )
					continue;
				if ( !handleValidateDragInOutline( array[i] ) )
					return false;
			}
			return true;
		}		
		if ( selection instanceof ReportElementModel )
		{
			return handleValidateDragInOutline( ( (ReportElementModel) selection ).getSlotHandle( ) );
		}
		if ( selection instanceof SlotHandle )
		{
			SlotHandle slot = (SlotHandle) selection;
			DesignElementHandle handle = slot.getElementHandle( );
			return slot.getContents( ).size( ) > 0
					&& ( handle instanceof ListHandle || handle instanceof ListGroupHandle );
		}
		if ( selection instanceof ColumnHandle )
		{
			int columnNumber = HandleAdapterFactory.getInstance( )
					.getColumnHandleAdapter( selection )
					.getColumnNumber( );
			Object parent = ( (ColumnHandle) selection ).getContainer( );
			if ( parent instanceof TableHandle )