Editing QAWiki:Guide/Mentions (section)

=== Choose the appropriate qualifier for linking properties to mentions ===

Relating to the previous point, QAWiki provides a number of different ways to link to a property depending on its relation to the mention. These include:

* '''Direct property''' ([[Property:P18|P18 (''Wikidata property ID'')]]) Use this when the property is a direct match for the phrase of the mention; for example, in the question "[[Item:Q82|''What is the population of Chile?'']]", the phrase "''population''" can be directly linked via to the Wikidata property [https://www.wikidata.org/wiki/Property:P1082 P1082 (population)] on Wikidata.

* '''Inverse property''' ([[Property:P45|P45 (''Wikidata inverse property ID'')]]) Use this when the property is an inverse match for the phrase of the mention; for example, in the question "[[Item:Q388|''Who discovered Pluto?'']]", the phrase "''discovered''" can be inversely linked to the Wikidata property [https://www.wikidata.org/wiki/Property:P61 P61 (''discoverer or inventor'')], noting that subject and object are flipped (''Clyde Tombaugh '''discovered''' Pluto'', vs. ''Pluto has '''discoverer''' Tombaugh''). <!-- SELECT ?q ?qLabel ?m ?vIri WHERE { ?q wdt:P1 wd:Q1 . ?q p:P38 ?o . ?o ps:P38 ?m . ?o pq:P45 ?v . BIND(IRI(CONCAT("http://www.wikidata.org/prop/",?v)) AS ?vIri) SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". } } -->

* '''Super property''' ([[Property:P58|P58 (''Wikidata super property ID'')]]) Use this when the property is a more general match for the phrase of the mention (and there is no better match); for example, in the question "[[Item:Q230|''Who is the prime minister of South Korea?'']]", we can use this qualifier to link the phrase "''prime minister''" with the more general Wikidata property [https://www.wikidata.org/wiki/Property:P6 P6 (''head of government'')] since there is no specific property for "''prime minister''". (There also exists a qualifier for the sub-property variant: [[Property:P59|P59 (''Wikidata sub property ID'')]].) <!-- SELECT ?q ?qLabel ?m ?vIri WHERE { ?q wdt:P1 wd:Q1 . ?q p:P38 ?o . ?o ps:P38 ?m . ?o pq:P58 ?v . BIND(IRI(CONCAT("http://www.wikidata.org/prop/",?v)) AS ?vIri) SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". } } -->

* '''Implicit property''' ([[Property:P50|P50 (''value for Wikidata property ID'')]]) Use this to annotate an entity mention whose linking property is not explicitly mentioned in the question text; for example, in the question "[[Item:Q371|''Which mathematician has the most followers on Twitter?'']]", the entity mention for "''mathematician''" can be annotated using this qualifier with the Wikidata property [https://www.wikidata.org/wiki/Property:P1687 P1687 (''occupation'')] (since the question does not mention "''occupation''" anywhere, and thus an explicit property mention is not applicable). As another example, for the question "[[Item:Q183|''Which Chilean companies have U.S. parent companies?'']]", the mention "''Chilean''" can be annotated with this qualifier to link it to the Wikidata property [https://www.wikidata.org/wiki/Property:P17 P17 (''country'')]. Another common usage is for gender, where in the question "[[Item:Q333|''Who is the richest woman in Germany'']]", the phrase "''woman''" has value [https://www.wikidata.org/wiki/Q6581072 Q6581072 (''female'')] for Wikidata property [https://www.wikidata.org/wiki/Property:P21 P21 (''sex or gender'')]).
<!-- SELECT ?q ?qLabel ?m ?vIri WHERE { ?q wdt:P1 wd:Q1 . ?q p:P38 ?o . ?o ps:P38 ?m . ?o pq:P50 ?v . BIND(IRI(CONCAT("http://www.wikidata.org/prop/",?v)) AS ?vIri) SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". } } -->

* '''Superlatives of properties''' ([[Property:P48|P48 (''maximum value of Wikidata property ID'')]]/[[Property:P49|P49 ''minimum value of Wikidata property ID'')]] Use this to indicate that a phrase refers to a superlative of a property. For example, in the question "[[Item:Q330|''What is the heaviest Pokémon?'']]", the phrase "''heaviest''" can be linked to the Wikidata property [https://www.wikidata.org/wiki/Property:P2067 P2067 (''mass'')] using the former (maximum value) qualifier. On the other hand, in the question "[[Item:Q152|''Is Michael Jackson the oldest child?'']], the phrase "''oldest''" can be linked to the Wikidata property [https://www.wikidata.org/wiki/Property:P569 P569 (''date of birth'')] using the latter (minimum value) qualifier. <!-- SELECT ?q ?qLabel ?m ?vIri WHERE { ?q wdt:P1 wd:Q1 . ?q p:P38 ?o . ?o ps:P38 ?m . ?o pq:P49 ?v . BIND(IRI(CONCAT("http://www.wikidata.org/prop/",?v)) AS ?vIri) SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". } } -->

* '''Existence/non-existence of values for properties''' ([[Property:P51|P51 (''exists value for Wikidata property ID'')]]/[[Property:P53|P53 (''not exists value for Wikidata property ID'')]]) Use this to indicate that a phrase refers to the existence, or lack thereof respectively, of a value for a given Wikidata property. For example, in the question "[[Item:Q145|''Is Justin Bieber dead?'']]", we can use the former qualifier to indicate that "''dead''" refers to the existence of a value for [https://www.wikidata.org/wiki/Property:P570 P570 (''date of death'')] or [https://www.wikidata.org/wiki/Property:P20 P20 (''place of death'')] (given the incompleteness of Wikidata, if multiple such properties are indicated, the existence of a value for ''any'' such property suffices). On the other hand, in the question "[[Item:Q144|''Is Justin Bieber alive?'']], we can use the latter qualifier to indicate that "''alive''" refers to the non-existence of a value for [https://www.wikidata.org/wiki/Property:P570 P570 (''date of death'')] and [https://www.wikidata.org/wiki/Property:P20 P20 (''place of death'')] (given the incompleteness of Wikidata, if multiple such properties are indicated, the non-existence of a value for ''all'' such properties suffices). <!-- SELECT ?q ?qLabel ?m ?vIri WHERE { ?q wdt:P1 wd:Q1 . ?q p:P38 ?o . ?o ps:P38 ?m . ?o pq:P51 ?v . BIND(IRI(CONCAT("http://www.wikidata.org/prop/",?v)) AS ?vIri) SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". } } --> There are also inverse versions of these qualifiers: [[Property:P55|P55 (''exists value for inverse Wikidata property ID'')]]/[[Property:P56|P56 (''not exists value for inverse  Wikidata property ID'')]].