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DC-ARCHITECTURE  July 2014

DC-ARCHITECTURE July 2014

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Subject:

Required/optional/repeatable vs. cardinality constraints Was: Re: AW: Database of Requirements on RDF Validation: http://purl.org/net/rdf-validation

From:

Adrian Pohl <[log in to unmask]>

Reply-To:

DCMI Architecture Forum <[log in to unmask]>

Date:

Tue, 22 Jul 2014 11:49:48 +0200

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (227 lines)

Hello.

On 21.07.2014 18:19, Bosch, Thomas wrote:
> Hi Evelyn, hi all,
>
> -Required Classes: so far, we do not have such a requirement
>
> -Non-repeatable Properties: so far, we do not have such a requirement

Regarding required, optional, repeatable, non-repeatable properties: 
Doesn't it suffice if you have a way to express minimum, exact and 
maximum cardinality? IMO, if these cardinality requirements are 
fulfilled you can describe - amongst others - the 
required/optional/repeatable cases:

- "required" is the same as minCardinality=1
- "optional" is the same as minCardinality=0
- "repeatable" can be expressed as a maxCardinality of >1 or not 
defining a maximum cardinality at all.
- non-repeatable could be expressed with exactCardinality=1 or 
maxCardinality=1.

If I see this right, I guess it wouldn't make sense to adress 
cardinality and required/optional/repeatable properties seperately in an 
AP vocabulary. Thus, we might somehow structure these requirements in 
the database to make it easier to maintain an overview.

Adrian

> -Non-repeatable Classes: What does this mean? Are you on the instance
> level? I.e. that there can be only (at most) one instance of a specific
> class in an RDF graph?
>
> -Properties that are not part of the model: do you mean something like
> ‘disallowed properties’? Properties that should not be allowed to be
> stated in an RDF graph?
>
> Best,
>
> Thomas
>
> --
>
> Thomas Bosch, M.Sc. (TUM)
>
> PhD student
>
> GESIS - Leibniz Institute for the Social Sciences
>
> Social Science Metadata Standards
>
> Visitors Address: B2,1, D-68159 Mannheim
>
> Postal Address: P.O.Box 12 21 55, D-68072 Mannheim
>
> Tel: + 49 (0) 621 / 1246-271
>
> Fax: + 49 (0) 621 / 1246-100
>
> Web: http://www.gesis.org <http://www.gesis.org/>
>
> Website: http://boschthomas.blogspot.com/
>
> GitHub: _https://github.com/boschthomas/PhD_
>
> *Von:*DCMI Architecture Forum [mailto:[log in to unmask]]
> *Im Auftrag von *Evelyn Dröge
> *Gesendet:* Montag, 21. Juli 2014 16:03
> *An:* [log in to unmask]
> *Betreff:* Re: Database of Requirements on RDF Validation:
> http://purl.org/net/rdf-validation
>
> Hi Thomas, hi all,
>
> thank you again, Thomas and Kai, for creating the database. I think this
> is a good help to structure and compare our use cases!
>
> I have some direct questions which I would like to discuss with you and
> others that work with the database.
>
> I could not find suitable requirements for the following cases:
>
>   - Required Classes (similar to R-68 Required Properties; could be
> connected to the use case for non-repeatable classes)
>
> - Non-repeatable Properties (opposite of R-70 Repeatable Properties; or
> can this requirement used for both?)
>
> - Non-repeatable Classes
>
> - Properties that are not part of the model (and should not be ingested,
> see UC-15)
>
> Do you have (or has anyone else) an idea how this could be linked to
> exisiting requirements? Otherwise I would suggest to expand the
> requirements collection.
>
> Another question: I have a case where I find it hard to distinguish
> between requirements.  This relates to UC-24 (Property value match; EDM)
> and UC-9 (Wrong Mime Types in DM2E). Should these use cases be connected
> with R-37 or with R-92 (or both)?
>
> Thanks for your help!
>
> Best,
>
> Evelyn
>
> Am 17.07.2014, 13:00 Uhr, schrieb Bosch, Thomas <[log in to unmask]
> <mailto:[log in to unmask]>>:
>
>     Hi all,
>
>     I'm new to this mailing list and I would like to indoduce myself.
>     My name is Thomas Bosch and I'm a PhD student in Computer Science in
>     my fourth year now.
>
>     I'm part of the editorial board of the DCMI RDF Application Profiles
>     Task Group [1],
>     whosepreliminary fields of work are (1) RDF Constraint Specification
>     and Validation, (2) Definition of an RDF Application Profile, and
>     (3) Request handling for RDF APs and data.
>
>     Together with Kai Eckert (University of Mannheim), we created a
>     database of requirements on RDF constraint formulation and
>     validation, which is publicly accessable via
>     http://purl.org/net/rdf-validation
>     and extensible by the community.
>
>     During the last half year, we identified more than 180 requirements
>     on RDF validation.
>     Sources have been (1) the 2013 W3C RDF Validation Workshop, (2) your
>     valuable mailing list discussions, (3) the 2013 Semantic Web in
>     Libraries conference,
>     (4) discussions in the RDF Application Profiles Task Group, and (5)
>     diverse research papers.
>
>     The idea of this extensible database is
>     (1) to collect and describe case studies from experts (from theory
>     and practice dealing with RDF validation problems) and the general
>     public,
>     (2) to extract common use cases from these case studies that
>     illustrate particular problems,
>     (3) to specify requirements to be fulfilled in order to adequately
>     solve these problems and meet the use cases,
>     (4) to investigate existing best-practices regarding these
>     requirements, and
>     (5) to evaluate existing approaches / tools to which extend specific
>     requirements are fulfilled.
>
>     Using this approach, we try to structure the requirements
>     engineering process for RDF validation.
>     I see that there is currently a lot of discussion about requirements
>     on RDF validation on this maling list, which I tried to capture in
>     the requirements DB as well.
>
>     The contributors of the DCMI RDF Application Profiles Task Group are
>     currently adding further case studies, use cases, requirements, and
>     relationships between these entities to the database.
>     This should be a work done for and from the community dealing with
>     RDF validation issues.
>
>     The full source code of the system and the database with the current
>     state of all requirements is also available:
>     https://github.com/kaiec/reqbase
>     You can easily set up a local version for own developments.
>
>     Do you think this is the right way to go?
>     Do you have further ideas?
>
>     We hope this kind of contribution could be helpful for the community.
>
>     Thank you very much and I really enjoy the valuable discussions on
>     the mailing list
>
>
>     Cheers,
>     Thomas
>
>     [1] http://wiki.dublincore.org/index.php/RDF-Application-Profiles
>
>     --
>
>     Thomas Bosch, M.Sc. (TUM)
>
>     PhD Student
>
>     GESIS - Leibniz Institute for the Social Sciences
>
>     Social Science Metadata Standards
>
>     Visitors Address: B2,1, D-68159 Mannheim
>
>     Postal Address: P.O.Box 12 21 55, D-68072 Mannheim
>
>     Tel: + 49 (0) 621 / 1246-271
>
>     Fax: + 49 (0) 621 / 1246-100
>
>     Web: http://www.gesis.org
>
>     Website: http://boschthomas.blogspot.com/
>     GitHub: _https://github.com/boschthomas/PhD_
>
>
>
> --
>
> Evelyn Dröge
>
> Humboldt-Universität zu Berlin
> Berlin School of Library and Information Science
> - Digitised Manuscripts to Europeana (DM2E) -
> Sitz: Dorotheenstraße 26, D-10117 Berlin
> Post: Unter den Linden 6, D-10099 Berlin
> Tel.: +49 30 2093-4265
>
> [log in to unmask] <mailto:[log in to unmask]>
> www.ibi.hu-berlin.de <http://www.ibi.hu-berlin.de> | dm2e.eu
>

-- 
Adrian Pohl
hbz - Hochschulbibliothekszentrum des Landes NRW
Tel: (+49)(0)221 - 400 75 235
http://www.hbz-nrw.de

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