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.ui/src/org/eclipse/birt/report/designer/internal/ui/dnd/InsertInLayoutUtil.java
{
			return handleValidateInsert( ( (IStructuredSelection) insertObj ).toArray( ) );
		}
		else if ( insertObj instanceof ParameterHandle )
		{
			if ( ( (ParameterHandle) insertObj ).getRoot( ) instanceof LibraryHandle )
				return false;
		}
		return insertObj instanceof DataSetHandle
				|| insertObj instanceof DataSetItemModel
				|| insertObj instanceof ScalarParameterHandle;
	}
	protected static void insertToCell( SlotHandle slot,
			DataSetItemModel[] columns, boolean isLabel )
	{
		for ( int i = 0; i < slot.getCount( ); i++ )
		{
			SlotHandle cells = ( (RowHandle) slot.get( i ) ).getCells( );
			for ( int j = 0; j < cells.getCount( ); j++ )
			{
				CellHandle cell = (CellHandle) cells.get( j );
				try
				{
					if ( isLabel )
					{