I think it is a reasonable ambition that the 'preferred' statement should always provide accurate information even when the qualifiers are missing.

For example, if we have population figures for various years and 'applies to part' figures for males, females, under 20's etc. then the most recent 'total' population figure should be the preferred value. Even without qualifiers this is a useful answer.

Similarly for Ronald Reagan the fact that he held the office of President is useful even if you don't give the start/end dates or the fact that it was 'of' the USA.

Wherever a statement would be misleading if you leave out the qualifiers then I think that is an indication that we need to have another look at the syntax and see how it can be fixed to comply with this principal.

We should do an RFC on Wikidata to make this policy and then amend the help pages to highlight this.

If this is accepted as wikidata policy then I suggest that a simple data dump should include all statements, even if qualifiers are not included, but that, where a statement has multiple values, some of which are 'preferred' then only the preferred values should be included. 

Yes?

Joe


On Fri, Jun 13, 2014 at 10:08 AM, Gerard Meijssen <gerard.meijssen@gmail.com> wrote:
Hoi,
When you leave out qualifiers, you will find that Ronald Reagan was never president of the United States and only an actor. Yes, omitting the statements with qualifiers is wrong but as a consequence the total of the information is wrong as well.

I do not see the point of this functionality. It is wrong any way I look at it. Without qualifiers information is wrong. Without statements information is wrong and without the items involved the information is incomplete and wrong.

As I see it you cannot win. Including this type of RDF export produces something that I fail to see serves any purpose or it is the purpose that you can.

Thanks,
     GerardM


On 11 June 2014 12:03, Markus Krötzsch <markus@semantic-mediawiki.org> wrote:
On 10/06/14 22:50, Gerard Meijssen wrote:
Hoi,
It is stated that there are no qualifiers included. In one of the
articles you write that it is to be understood that the vailidity of the
information is dependent on the existing qualifiers.

What is the value of these RDF exports with the qualifiers missing?

Our normal exports include all the qualifiers and references.

Our simplified exports include only those statements that don't have qualifiers. You are right that it would lead to wrong information to leave away quantifiers.

Cheers,

Markus

Thanks,
      GerardM


On 10 June 2014 10:43, Markus Kroetzsch <markus.kroetzsch@tu-dresden.de
<mailto:markus.kroetzsch@tu-dresden.de>> wrote:

    Hi all,

    We are now offering regular RDF dumps for the content of Wikidata:

    http://tools.wmflabs.org/__wikidata-exports/rdf/

    <http://tools.wmflabs.org/wikidata-exports/rdf/>

    RDF is the Resource Description Framework of the W3C that can be
    used to exchange data on the Web. The Wikidata RDF exports consist
    of several files that contain different parts and views of the data,
    and which can be used independently. Details on the available
    exports and the RDF encoding used in each can be found in the paper
    "Introducing Wikidata to the Linked Data Web" [1].

    The available RDF exports can be found in the directory
    http://tools.wmflabs.org/__wikidata-exports/rdf/exports/
    <http://tools.wmflabs.org/wikidata-exports/rdf/exports/>. New

    exports are generated regularly from current data dumps of Wikidata
    and will appear in this directory shortly afterwards.

    All dump files have been generated using Wikidata Toolkit [2]. There
    are some important differences in comparison to earlier dumps:

    * Data is split into several dump files for convenience. Pick
    whatever you are most interested in.
    * All dumps are generated using the OpenRDF library for Java (better
    quality than ad hoc serialization; much slower too ;-)
    * All dumps are in N3 format, the simplest RDF serialization format
    that there is
    * In addition to the faithful dumps, some simplified dumps are also
    available (one statement = one triple; no qualifiers and references).
    * Links to external data sets are added to the data for Wikidata
    properties that point to datasets with RDF exports. That's the
    "Linked" in "Linked Open Data".

    Suggestions for improvements and contributions on github are welcome.

    Cheers,

    Markus

    [1]
    http://korrekt.org/page/__Introducing_Wikidata_to_the___Linked_Data_Web
    <http://korrekt.org/page/Introducing_Wikidata_to_the_Linked_Data_Web>
    [2] https://www.mediawiki.org/__wiki/Wikidata_Toolkit

    <https://www.mediawiki.org/wiki/Wikidata_Toolkit>

    --
    Markus Kroetzsch
    Faculty of Computer Science
    Technische Universität Dresden
    +49 351 463 38486 <tel:%2B49%20351%20463%2038486>
    http://korrekt.org/

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