On Oct 22, 2015, at 10:25 AM, Thomas Douillard
<thomas.douillard(a)gmail.com> wrote:
Great tool ! The error detection is precious !
2015-10-22 17:31 GMT+02:00 Markus Kroetzsch <markus.kroetzsch(a)tu-dresden.de
<mailto:markus.kroetzsch@tu-dresden.de>>:
Hi all,
I am happy to announce a new tool [1], written by Serge Stratan, which allows you to
browse the taxonomy (subclass of & instance of relations) between Wikidata's most
important class items. For example, here is the Wikidata taxonomy for Pizza (discussed
recently on this list):
http://sergestratan.bitbucket.org?draw=true&optid=s0&item=177,2095,…
<http://sergestratan.bitbucket.org/?draw=true&optid=s0&item=177,2095,7802,28877,35120,223557,386724,488383,666242,736427,746549,2424752,15222213,16686448>
== What you see there ==
Solid green lines mean "subclass of" relations (subclasses are lower), while
dashed purple lines are "instance of" relations (instances are lower). Drag and
zoom the view as usual. Hover over items for more information. Click on arrows with
numbers to display upper or lower neighbours. Right-click on classes to get more options.
The sidebar on the left shows statistics and presumed problems in the data (redundancies
and likely errors). You can select a report type to see the reports, and click on any line
to show the error. If you search for a class in the search field, the errors will be
narrowed down to issues related to the taxonomy of this class.
The toolbar at the top has options to show and hide items based on the current selection
(left click on any box).
Edges in red are the wrong way around (top to bottom). This occurs only when there are
cycles in the "taxonomy".
== Micro tutorial ==
(1) Enter "Unicorn" in the search box, press return.
(2) Zoom out a bit by scrolling your mouse/touchpad
(3) Click on the "Unicorn" item box. It becomes blue (selected).
(4) Click "Expand up" in the toolbar at the top
(5) Zoom out to see the taxonomy of unicorn
(6) Find the class "Fictional Horse" (directly above unicorn) and click its
downwards arrow labelled "3" to see all three children items of "fictional
horse".
(7) Click the share button on the top right to get a link to this view.
You can also create your own share link manually by just changing the Qids in the URL as
you like.
== Status and limitations ==
This is a prototype and it still has some limits:
* It only shows "proper" classes that have at least one instance or subclass.
This is to reduce the overall data size and load time.
* The data is based on dumps (the date is shown on the right). It is not a live view.
* The layout is sometimes too dense. You can find a "hidden" option to make it
more spacy behind the sidebar (click "Sidebar" to see it). This helps to
disentangle larger graphs.
* There are some minor bugs in the UI. You sometimes need to click more than once until
the right thing happens.
* The help page at
http://sergestratan.bitbucket.org/howtouse.html
<http://sergestratan.bitbucket.org/howtouse.html> does not explain everything in
detail yet.
It is planned to work on some of these limitations in the future.
The hope is that this tool will reveal many errors in Wikidata's taxonomy that are
otherwise hard to detect. For example, you can see easily that every "Ship" is
an "Event" in Wikidata, that every "Hobbit" is a "Fantasy
Race", and that every "Monday" is both a "Mathematical object"
and a "Unit of measurement".
Feedback is welcome (on the tool; better start new threads for feedback on the Wikidata
taxonomy ;-),
Markus
[1]
http://sergestratan.bitbucket.org <http://sergestratan.bitbucket.org/>
--
Markus Kroetzsch
Faculty of Computer Science
Technische Universität Dresden
+49 351 463 38486 <tel:%2B49%20351%20463%2038486>
http://korrekt.org/ <http://korrekt.org/>
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