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
}
		if ( targetObj instanceof Object[] )
		{
			Object[] array = (Object[]) targetObj;
			for ( int i = 0; i < array.length; i++ )
			{
				if ( !handleValidateTargetCanContainMore( array[i], length ) )
				{
					return false;
				}
			}
			return true;
		}
		targetObj = unwrapToModel( targetObj );
		if ( targetObj instanceof SlotHandle )
		{
			SlotHandle slot = (SlotHandle) targetObj;
			return slot.getElementHandle( )
					.getDefn( )
					.getSlot( slot.getSlotID( ) )
					.isMultipleCardinality( )
					|| slot.getCount( ) < 1
					&& length <= 1;
		}
		return targetObj instanceof DesignElementHandle
				|| targetObj instanceof EmbeddedImageNode;
	}
	/**
	 * Validates target elements can contain specified type of transfer data
	 *