[Moims-dai] Question about Reversible Transformation

Prof. Dr.-Ing. Matthias L. Hemmje Matthias.Hemmje at fernuni-hagen.de
Wed Nov 23 07:55:41 UTC 2016

Dear John,


I think in general the concept of an entity ist o vague. The concept of a
component would refer to something technical and the concept of an item to
an element of a collection.


Therefore, the term „object“ should be used. Ideally it should be Digital
Object to distinguish from real world Objects.


Best regards



Prof. Dr.-Ing. Matthias L. Hemmje

FernUniversität in Hagen – Fakultät für Mathematik und Informatik –
Lehrgebiet Multimedia und Internetanwendungen
Universitätsstrasse 1 – D-58097 Hagen – Germany

Email:  <mailto:Matthias.Hemmje at fernuni-hagen.de>
Matthias.Hemmje at fernuni-hagen.de – Web:  <http://www.fernuni-hagen.de/>

Phone: +49 (2331) 987-304 – Mobile: +49 (172) 6840262 – Fax: +49 (2331)
987-4487 – Skype: Matthias.Hemmje


Von: MOIMS-DAI [mailto:moims-dai-bounces at mailman.ccsds.org] Im Auftrag von
John Garrett
Gesendet: Sonntag, 20. November 2016 08:15
An: 'MOIMS-Data Archive Ingestion' <moims-dai at mailman.ccsds.org>
Betreff: Re: [Moims-dai] Question about Reversible Transformation




I think the explanation of Reversible Transformation with examples later in
the document is helpful in understanding what is meant.


It might help to replace ‘entity’ with ‘component’ or ‘item’ or ‘thing’ or


For version 3 that we are working on now.  I think I might drop the second
‘resulting’ and ‘base’ in an updated definition.  Would that change anyone’s
understanding the term?


Wishing you prosperity and peace,



From: MOIMS-DAI [mailto:moims-dai-bounces at mailman.ccsds.org] On Behalf Of
Caillet Claire
Sent: Thursday, November 17, 2016 4:17 AM
To: MOIMS-Data Archive Ingestion <moims-dai at mailman.ccsds.org
<mailto:moims-dai at mailman.ccsds.org> >
Subject: [Moims-dai] Question about Reversible Transformation


Dear all,


Once again, in the translation work of the OAIS, we have some questions. It
is about the definition of the Reversible Transformation (A Transformation
in which the new representation defines a set (or a subset) of resulting
entities that are equivalent to the resulting entities defined by the
original representation.  This means that there is a one-to-one mapping back
to the original representation and its set of base entities.).


What is meant by “resulting entities” and “base entities” ? Is the
one-to-one mapping between the original representation and its base entities
or between the new and the original representation base entities ?


Thanks for you help.


Claire Caillet




Centre Spatial de Toulouse

Tel.: +33 5 61 28 14 38

e-mail : claire.caillet at cnes.fr <mailto:claire.caillet at cnes.fr> 


18 Avenue Edouard Belin 

31 401 Toulouse Cedex 4




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