Hi, a small question about qualifiers and ranks.
It is well known that the number of planets changed in 2006. Or did it ? Of course, Pluto is still here, it's just its status that changed. The definition of planets changed in 2006.
This imply that (imho), the statement "the number of planets in the solar system in 9" should be deprecated. But infovarius did not agree with me and changed the rank of the claim back to normal and put an end date. I still think it should be deprecated, but it raise me a question: How are we supposed (if we are) to express an information about a deprecation ? Should we include something about the deprecation in the sources ? Should we have a qualifier ''deprecation date'' ?
Hi,
General case first: Many statements depend on time and have an end date (e.g., population numbers). The general approach there is to (1) have a qualifier that clarifies the restricted temporal validity and (2) make the current statement "preferred". So your idea with the ranks was a good starting point, but it should be "normal" and "preferred" instead of "deprecated" and "normal". And infovarius was also right in this sense to use a temporal quantifier. Note that more than one statement can be preferred if more than one is current (this could be relevant, e.g., for the classes that Pluto is/was an instance of).
However, this answer is only about the general pattern of dealing with things that changed over time, and the intended use of ranks in this case. Things might be different here. It's a special case in that it was not so much the world that changed but the definition, so the real question is what our property "number of planets" really means:
(1) "Number of planets at a given time (given as a qualifier), based on the definition of planet adopted at this time" (2) "Number of planets according to the definition that was used when the property was introduced" (3) "Number of planets according to the definition that is current right now"
(3) is problematic since it means that the meaning of the property would change over time, and statements that were true will become false. I would strongly discourage this. But both (1) and (2) are possible. If one wants to use (1) then *every* statement with this property must have some time qualifier -- otherwise it will not make any sense since one would not know which definition is meant.
In case (2), the number of planets of our solar system is 8, and nothing else. It has never been 9 *according to the definition of planet used by this property*. So if this interpretation is adopted, then the statement with value 9 should really at best be there in a deprecated form, not in a temporal form. It could make sense to keep a deprecated form to warn other users that this should not be reintroduced.
One could also add more options, e.g., one could have a qualifier that specifies the definition of planet that is used. This would be a bit like (1) but instead of time one would now always need to specify a definition, and the statements would not be temporal at all (the number would always remain 9 according to the old definition). One could still use "preferred" to mark the statement that is based on the most common definition.
The world is beautifully complicated, isn't it? I'll leave it to you experts to discuss what makes sense here here :-)
Best regards,
Markus
On 29.04.2015 18:05, Thomas Douillard wrote:
Hi, a small question about qualifiers and ranks.
It is well known that the number of planets changed in 2006. Or did it ? Of course, Pluto is still here, it's just its status that changed. The definition of planets changed in 2006.
This imply that (imho), the statement "the number of planets in the solar system in 9" should be deprecated. But infovarius did not agree with me and changed the rank of the claim back to normal and put an end date. I still think it should be deprecated, but it raise me a question: How are we supposed (if we are) to express an information about a deprecation ? Should we include something about the deprecation in the sources ? Should we have a qualifier ''deprecation date'' ?
https://www.wikidata.org/wiki/Q17362350
Wikidata-l mailing list Wikidata-l@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-l
Actually, like it is, there is no *number of planets* property, there is a class of planet (solar system planet) together with a *number of instances* property. This might save us : we can have two item : * solar system planet (old style definition) and * solar system planet (new style definition) This might just put the problem in another place though :) although this might not change the correctness of statements like *<solar system*> <has part> <*solar system planet* (old style)> :)
Pluto can still be an old style definition planet, and maybe <solar system planet> is a subclass of <*solar system planet* (old style)>
Thinking about it, classes are naturally a good way to deal with definitions.
2015-04-29 19:35 GMT+02:00 Markus Krötzsch markus@semantic-mediawiki.org:
Hi,
General case first: Many statements depend on time and have an end date (e.g., population numbers). The general approach there is to (1) have a qualifier that clarifies the restricted temporal validity and (2) make the current statement "preferred". So your idea with the ranks was a good starting point, but it should be "normal" and "preferred" instead of "deprecated" and "normal". And infovarius was also right in this sense to use a temporal quantifier. Note that more than one statement can be preferred if more than one is current (this could be relevant, e.g., for the classes that Pluto is/was an instance of).
However, this answer is only about the general pattern of dealing with things that changed over time, and the intended use of ranks in this case. Things might be different here. It's a special case in that it was not so much the world that changed but the definition, so the real question is what our property "number of planets" really means:
(1) "Number of planets at a given time (given as a qualifier), based on the definition of planet adopted at this time" (2) "Number of planets according to the definition that was used when the property was introduced" (3) "Number of planets according to the definition that is current right now"
(3) is problematic since it means that the meaning of the property would change over time, and statements that were true will become false. I would strongly discourage this. But both (1) and (2) are possible. If one wants to use (1) then *every* statement with this property must have some time qualifier -- otherwise it will not make any sense since one would not know which definition is meant.
In case (2), the number of planets of our solar system is 8, and nothing else. It has never been 9 *according to the definition of planet used by this property*. So if this interpretation is adopted, then the statement with value 9 should really at best be there in a deprecated form, not in a temporal form. It could make sense to keep a deprecated form to warn other users that this should not be reintroduced.
One could also add more options, e.g., one could have a qualifier that specifies the definition of planet that is used. This would be a bit like (1) but instead of time one would now always need to specify a definition, and the statements would not be temporal at all (the number would always remain 9 according to the old definition). One could still use "preferred" to mark the statement that is based on the most common definition.
The world is beautifully complicated, isn't it? I'll leave it to you experts to discuss what makes sense here here :-)
Best regards,
Markus
On 29.04.2015 18:05, Thomas Douillard wrote:
Hi, a small question about qualifiers and ranks.
It is well known that the number of planets changed in 2006. Or did it ? Of course, Pluto is still here, it's just its status that changed. The definition of planets changed in 2006.
This imply that (imho), the statement "the number of planets in the solar system in 9" should be deprecated. But infovarius did not agree with me and changed the rank of the claim back to normal and put an end date. I still think it should be deprecated, but it raise me a question: How are we supposed (if we are) to express an information about a deprecation ? Should we include something about the deprecation in the sources ? Should we have a qualifier ''deprecation date'' ?
https://www.wikidata.org/wiki/Q17362350
Wikidata-l mailing list Wikidata-l@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-l
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Ok, sounds reasonable.
In all of these cases I do wonder though why we need to store the number at all. We can just count the instances, can we not? Queries allow for this (and will be an official feature in due course).
And in cases where not all instances are supposed to be on Wikidata, there are usually better ways to store the number, e.g., "population of Earth" is better than "number of instances of living person" (besides the fact that we don't have "living person").
Regards,
Markus
On 29.04.2015 20:29, Thomas Douillard wrote:
Actually, like it is, there is no /number of planets/ property, there is a class of planet (solar system planet) together with a /number of instances/ property. This might save us : we can have two item :
- solar system planet (old style definition) and
- solar system planet (new style definition) This might just put the problem in another place though :) although
this might not change the correctness of statements like /<solar system/> <has part> </solar system planet/ (old style)> :)
Pluto can still be an old style definition planet, and maybe <solar system planet> is a subclass of </solar system planet/ (old style)>
Thinking about it, classes are naturally a good way to deal with definitions.
2015-04-29 19:35 GMT+02:00 Markus Krötzsch <markus@semantic-mediawiki.org mailto:markus@semantic-mediawiki.org>:
Hi, General case first: Many statements depend on time and have an end date (e.g., population numbers). The general approach there is to (1) have a qualifier that clarifies the restricted temporal validity and (2) make the current statement "preferred". So your idea with the ranks was a good starting point, but it should be "normal" and "preferred" instead of "deprecated" and "normal". And infovarius was also right in this sense to use a temporal quantifier. Note that more than one statement can be preferred if more than one is current (this could be relevant, e.g., for the classes that Pluto is/was an instance of). However, this answer is only about the general pattern of dealing with things that changed over time, and the intended use of ranks in this case. Things might be different here. It's a special case in that it was not so much the world that changed but the definition, so the real question is what our property "number of planets" really means: (1) "Number of planets at a given time (given as a qualifier), based on the definition of planet adopted at this time" (2) "Number of planets according to the definition that was used when the property was introduced" (3) "Number of planets according to the definition that is current right now" (3) is problematic since it means that the meaning of the property would change over time, and statements that were true will become false. I would strongly discourage this. But both (1) and (2) are possible. If one wants to use (1) then *every* statement with this property must have some time qualifier -- otherwise it will not make any sense since one would not know which definition is meant. In case (2), the number of planets of our solar system is 8, and nothing else. It has never been 9 *according to the definition of planet used by this property*. So if this interpretation is adopted, then the statement with value 9 should really at best be there in a deprecated form, not in a temporal form. It could make sense to keep a deprecated form to warn other users that this should not be reintroduced. One could also add more options, e.g., one could have a qualifier that specifies the definition of planet that is used. This would be a bit like (1) but instead of time one would now always need to specify a definition, and the statements would not be temporal at all (the number would always remain 9 according to the old definition). One could still use "preferred" to mark the statement that is based on the most common definition. The world is beautifully complicated, isn't it? I'll leave it to you experts to discuss what makes sense here here :-) Best regards, Markus On 29.04.2015 18:05, Thomas Douillard wrote: Hi, a small question about qualifiers and ranks. It is well known that the number of planets changed in 2006. Or did it ? Of course, Pluto is still here, it's just its status that changed. The definition of planets changed in 2006. This imply that (imho), the statement "the number of planets in the solar system in 9" should be deprecated. But infovarius did not agree with me and changed the rank of the claim back to normal and put an end date. I still think it should be deprecated, but it raise me a question: How are we supposed (if we are) to express an information about a deprecation ? Should we include something about the deprecation in the sources ? Should we have a qualifier ''deprecation date'' ? https://www.wikidata.org/wiki/Q17362350 _______________________________________________ Wikidata-l mailing list Wikidata-l@lists.wikimedia.org <mailto:Wikidata-l@lists.wikimedia.org> https://lists.wikimedia.org/mailman/listinfo/wikidata-l _______________________________________________ Wikidata-l mailing list Wikidata-l@lists.wikimedia.org <mailto:Wikidata-l@lists.wikimedia.org> https://lists.wikimedia.org/mailman/listinfo/wikidata-l
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I guess number of instances works in more cases, for example the number of iphone ever built could work ... actually if I look at the ''Population'' article in frwiki, I get "Une *population* est un ensemble d'individus ou d'éléments partageant une ou plusieurs caractéristiques qui servent à les regrouper." (a population is a set of individuals or elements sharing one or several characters that allows to regroup them", this seems another word for "class" :) So I guess it's just a matter of vocabulary.
I guess the population of earth is the number of instances of the "human on earth" class :)
On the other hand, human population is kind of a natural property for a country, its number of wolfes for example may not be worth having a property. Having an item "French Wolf" with a property "number of instances" is way more convenient and generic, and could avoid the burden of having to create (potentially a big number of) properties for each kind of animals we might want to store population in some places.
2015-04-29 21:19 GMT+02:00 Markus Krötzsch markus@semantic-mediawiki.org:
Ok, sounds reasonable.
In all of these cases I do wonder though why we need to store the number at all. We can just count the instances, can we not? Queries allow for this (and will be an official feature in due course).
And in cases where not all instances are supposed to be on Wikidata, there are usually better ways to store the number, e.g., "population of Earth" is better than "number of instances of living person" (besides the fact that we don't have "living person").
Regards,
Markus
On 29.04.2015 20:29, Thomas Douillard wrote:
Actually, like it is, there is no /number of planets/ property, there is a class of planet (solar system planet) together with a /number of instances/ property. This might save us : we can have two item :
- solar system planet (old style definition) and
- solar system planet (new style definition) This might just put the problem in another place though :) although
this might not change the correctness of statements like /<solar system/> <has part> </solar system planet/ (old style)> :)
Pluto can still be an old style definition planet, and maybe <solar system planet> is a subclass of </solar system planet/ (old style)>
Thinking about it, classes are naturally a good way to deal with definitions.
2015-04-29 19:35 GMT+02:00 Markus Krötzsch <markus@semantic-mediawiki.org mailto:markus@semantic-mediawiki.org>:
Hi, General case first: Many statements depend on time and have an end date (e.g., population numbers). The general approach there is to (1) have a qualifier that clarifies the restricted temporal validity and (2) make the current statement "preferred". So your idea with the ranks was a good starting point, but it should be "normal" and "preferred" instead of "deprecated" and "normal". And infovarius was also right in this sense to use a temporal quantifier. Note that more than one statement can be preferred if more than one is current (this could be relevant, e.g., for the classes that Pluto is/was an instance of). However, this answer is only about the general pattern of dealing with things that changed over time, and the intended use of ranks in this case. Things might be different here. It's a special case in that it was not so much the world that changed but the definition, so the real question is what our property "number of planets" really means: (1) "Number of planets at a given time (given as a qualifier), based on the definition of planet adopted at this time" (2) "Number of planets according to the definition that was used when the property was introduced" (3) "Number of planets according to the definition that is current right now" (3) is problematic since it means that the meaning of the property would change over time, and statements that were true will become false. I would strongly discourage this. But both (1) and (2) are possible. If one wants to use (1) then *every* statement with this property must have some time qualifier -- otherwise it will not make any sense since one would not know which definition is meant. In case (2), the number of planets of our solar system is 8, and nothing else. It has never been 9 *according to the definition of planet used by this property*. So if this interpretation is adopted, then the statement with value 9 should really at best be there in a deprecated form, not in a temporal form. It could make sense to keep a deprecated form to warn other users that this should not be reintroduced. One could also add more options, e.g., one could have a qualifier that specifies the definition of planet that is used. This would be a bit like (1) but instead of time one would now always need to specify a definition, and the statements would not be temporal at all (the number would always remain 9 according to the old definition). One could still use "preferred" to mark the statement that is based on the most common definition. The world is beautifully complicated, isn't it? I'll leave it to you experts to discuss what makes sense here here :-) Best regards, Markus On 29.04.2015 18:05, Thomas Douillard wrote: Hi, a small question about qualifiers and ranks. It is well known that the number of planets changed in 2006. Or did it ? Of course, Pluto is still here, it's just its status that changed. The definition of planets changed in 2006. This imply that (imho), the statement "the number of planets in
the solar system in 9" should be deprecated. But infovarius did not agree with me and changed the rank of the claim back to normal and put an end date. I still think it should be deprecated, but it raise me a question: How are we supposed (if we are) to express an information about a deprecation ? Should we include something about the deprecation in the sources ? Should we have a qualifier ''deprecation date'' ?
https://www.wikidata.org/wiki/Q17362350 _______________________________________________ Wikidata-l mailing list Wikidata-l@lists.wikimedia.org <mailto:Wikidata-l@lists.wikimedia.org> https://lists.wikimedia.org/mailman/listinfo/wikidata-l _______________________________________________ Wikidata-l mailing list Wikidata-l@lists.wikimedia.org <mailto:Wikidata-l@lists.wikimedia.org
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Infovarius even complicated the problem, he put the number of "known" planets at some time with a qualifier for validity :)
2015-04-29 19:35 GMT+02:00 Markus Krötzsch markus@semantic-mediawiki.org:
Hi,
General case first: Many statements depend on time and have an end date (e.g., population numbers). The general approach there is to (1) have a qualifier that clarifies the restricted temporal validity and (2) make the current statement "preferred". So your idea with the ranks was a good starting point, but it should be "normal" and "preferred" instead of "deprecated" and "normal". And infovarius was also right in this sense to use a temporal quantifier. Note that more than one statement can be preferred if more than one is current (this could be relevant, e.g., for the classes that Pluto is/was an instance of).
However, this answer is only about the general pattern of dealing with things that changed over time, and the intended use of ranks in this case. Things might be different here. It's a special case in that it was not so much the world that changed but the definition, so the real question is what our property "number of planets" really means:
(1) "Number of planets at a given time (given as a qualifier), based on the definition of planet adopted at this time" (2) "Number of planets according to the definition that was used when the property was introduced" (3) "Number of planets according to the definition that is current right now"
(3) is problematic since it means that the meaning of the property would change over time, and statements that were true will become false. I would strongly discourage this. But both (1) and (2) are possible. If one wants to use (1) then *every* statement with this property must have some time qualifier -- otherwise it will not make any sense since one would not know which definition is meant.
In case (2), the number of planets of our solar system is 8, and nothing else. It has never been 9 *according to the definition of planet used by this property*. So if this interpretation is adopted, then the statement with value 9 should really at best be there in a deprecated form, not in a temporal form. It could make sense to keep a deprecated form to warn other users that this should not be reintroduced.
One could also add more options, e.g., one could have a qualifier that specifies the definition of planet that is used. This would be a bit like (1) but instead of time one would now always need to specify a definition, and the statements would not be temporal at all (the number would always remain 9 according to the old definition). One could still use "preferred" to mark the statement that is based on the most common definition.
The world is beautifully complicated, isn't it? I'll leave it to you experts to discuss what makes sense here here :-)
Best regards,
Markus
On 29.04.2015 18:05, Thomas Douillard wrote:
Hi, a small question about qualifiers and ranks.
It is well known that the number of planets changed in 2006. Or did it ? Of course, Pluto is still here, it's just its status that changed. The definition of planets changed in 2006.
This imply that (imho), the statement "the number of planets in the solar system in 9" should be deprecated. But infovarius did not agree with me and changed the rank of the claim back to normal and put an end date. I still think it should be deprecated, but it raise me a question: How are we supposed (if we are) to express an information about a deprecation ? Should we include something about the deprecation in the sources ? Should we have a qualifier ''deprecation date'' ?
https://www.wikidata.org/wiki/Q17362350
Wikidata-l mailing list Wikidata-l@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-l
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On 30 April 2015 at 12:37, Thomas Douillard thomas.douillard@gmail.com wrote:
Infovarius even complicated the problem, he put the number of "known" planets at some time with a qualifier for validity :)
Just to throw a real spanner in the works: for a lot of the nineteenth century the number varied widely. The "eighth planet" was discovered in 1801, and is what we'd now think of as the asteroid or dwarf planet Ceres; the "real" eighth planet, Neptune, wasn't discovered until 1851.
Newly discovered asteroids were thought of as 'planets' for some time (I have an 1843 schoolbook somewhere that confidently tells children there were eleven planets...) until by about 1850, it became clear that having twenty or so very small planets with more discovered every year was confusing, and the meaning of the word shifted. There was no formal agreement (as was the case in 2006) so no specific end date.
The moral of this story is probably that trying to express complex things in Wikidata is not always practical :-)
It may not be practical, but it is still possible ;) classes like ''astronomic corp that was thought to be a planet in 1850'' are an option :)
2015-04-30 13:51 GMT+02:00 Andrew Gray andrew.gray@dunelm.org.uk:
On 30 April 2015 at 12:37, Thomas Douillard thomas.douillard@gmail.com wrote:
Infovarius even complicated the problem, he put the number of "known" planets at some time with a qualifier for validity :)
Just to throw a real spanner in the works: for a lot of the nineteenth century the number varied widely. The "eighth planet" was discovered in 1801, and is what we'd now think of as the asteroid or dwarf planet Ceres; the "real" eighth planet, Neptune, wasn't discovered until 1851.
Newly discovered asteroids were thought of as 'planets' for some time (I have an 1843 schoolbook somewhere that confidently tells children there were eleven planets...) until by about 1850, it became clear that having twenty or so very small planets with more discovered every year was confusing, and the meaning of the word shifted. There was no formal agreement (as was the case in 2006) so no specific end date.
The moral of this story is probably that trying to express complex things in Wikidata is not always practical :-)
--
- Andrew Gray andrew.gray@dunelm.org.uk
Wikidata-l mailing list Wikidata-l@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-l
@Thomas is close to the right answer.
Nothing about Pluto changed, it was the definition of Planet that is changed so you need two different definitions of Planets, but note that the definitions of themselves are somewhat timeless, so you are really pointing to some specific definition of a planet in either case.
There is no reason why this is not practical. It is just a matter of putting in another type, and maintenance is not a tough problem since there are fewer than 10 of them. There could be some need for vocabulary to describe the attributes of the definitions, but simply a link to a defining document is "good enough" from the viewpoint of grounding.
On Thu, Apr 30, 2015 at 12:20 PM, Thomas Douillard < thomas.douillard@gmail.com> wrote:
It may not be practical, but it is still possible ;) classes like ''astronomic corp that was thought to be a planet in 1850'' are an option :)
2015-04-30 13:51 GMT+02:00 Andrew Gray andrew.gray@dunelm.org.uk:
On 30 April 2015 at 12:37, Thomas Douillard thomas.douillard@gmail.com wrote:
Infovarius even complicated the problem, he put the number of "known" planets at some time with a qualifier for validity :)
Just to throw a real spanner in the works: for a lot of the nineteenth century the number varied widely. The "eighth planet" was discovered in 1801, and is what we'd now think of as the asteroid or dwarf planet Ceres; the "real" eighth planet, Neptune, wasn't discovered until 1851.
Newly discovered asteroids were thought of as 'planets' for some time (I have an 1843 schoolbook somewhere that confidently tells children there were eleven planets...) until by about 1850, it became clear that having twenty or so very small planets with more discovered every year was confusing, and the meaning of the word shifted. There was no formal agreement (as was the case in 2006) so no specific end date.
The moral of this story is probably that trying to express complex things in Wikidata is not always practical :-)
--
- Andrew Gray andrew.gray@dunelm.org.uk
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Hoi, It strikes me as another example of a search for perfection where we do not even cater for what is good. Our priorities should be with what is common and present it well not with a game of trivia that upset showing what is good and common. Thanks, GerardM
On 30 April 2015 at 18:33, Paul Houle ontology2@gmail.com wrote:
@Thomas is close to the right answer.
Nothing about Pluto changed, it was the definition of Planet that is changed so you need two different definitions of Planets, but note that the definitions of themselves are somewhat timeless, so you are really pointing to some specific definition of a planet in either case.
There is no reason why this is not practical. It is just a matter of putting in another type, and maintenance is not a tough problem since there are fewer than 10 of them. There could be some need for vocabulary to describe the attributes of the definitions, but simply a link to a defining document is "good enough" from the viewpoint of grounding.
On Thu, Apr 30, 2015 at 12:20 PM, Thomas Douillard < thomas.douillard@gmail.com> wrote:
It may not be practical, but it is still possible ;) classes like ''astronomic corp that was thought to be a planet in 1850'' are an option :)
2015-04-30 13:51 GMT+02:00 Andrew Gray andrew.gray@dunelm.org.uk:
On 30 April 2015 at 12:37, Thomas Douillard thomas.douillard@gmail.com wrote:
Infovarius even complicated the problem, he put the number of "known" planets at some time with a qualifier for validity :)
Just to throw a real spanner in the works: for a lot of the nineteenth century the number varied widely. The "eighth planet" was discovered in 1801, and is what we'd now think of as the asteroid or dwarf planet Ceres; the "real" eighth planet, Neptune, wasn't discovered until 1851.
Newly discovered asteroids were thought of as 'planets' for some time (I have an 1843 schoolbook somewhere that confidently tells children there were eleven planets...) until by about 1850, it became clear that having twenty or so very small planets with more discovered every year was confusing, and the meaning of the word shifted. There was no formal agreement (as was the case in 2006) so no specific end date.
The moral of this story is probably that trying to express complex things in Wikidata is not always practical :-)
--
- Andrew Gray andrew.gray@dunelm.org.uk
Wikidata-l mailing list Wikidata-l@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-l
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-- Paul Houle
*Applying Schemas for Natural Language Processing, Distributed Systems, Classification and Text Mining and Data Lakes*
(607) 539 6254 paul.houle on Skype ontology2@gmail.com https://legalentityidentifier.info/lei/lookup http://legalentityidentifier.info/lei/lookup
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