Help:Verklaringen

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In Wikidata wordt een concept, onderwerp of object (een entiteit) vertegenwoordigt met behulp van een item. Elk item heeft zijn eigen pagina. Met behulp van 'verklaringen kunnen we informatie die we over het item weten opnemen in Wikidata. Hiervoor koppelen we een eigenschap met ten minste een waarde, hierdoor ontstaat het begin van een verklaring. Verklaringen kunnen uitgebreid worden met extra waarden, maar ook met optionele kwalificaties, bronnen en rangen. Verklaringen zorgen er tevens voor dat items met elkaar worden gekoppeld, zodat er een gekoppelde datastructuur ontstaat.

Language item property Waarde
Engels Marie Curie occupation physicist
Duits Marie Curie Tätigkeit Physiker
Frans Marie Curie occupation physicien
Pools Maria Skłodowska-Curie zajęcie fizyk
Nederlands Marie Curie beroep natuurkundige
  Q7186 P106 Q169470

Voorbeeld:

In order to include information about the occupation of Marie Curie in Wikidata, you would need to add a statement to the item for Marie Curie, Marie Curie (Q7186). Using the property, occupation (P106), you could then add the value physicist (Q169470). You could also add the value chemist (Q593644). Note how both chemist and physicist have their own pages in Wikidata, thereby allowing Marie Curie to be linked to these items.

Language independent general principles

Overzicht van een Wikidata-verklaring
example of a simple statement consisting of one property-value pair
example of a statement consisting of multiple values for one property
example of a strong Wikidata statement consisting of one property-value pair, qualifiers, and a reference

Een verklaring bestaat uit een combinatie van een eigenschap en een waarde, zoals land: Duitsland.

The property in a statement describes the data value, and can be thought of as a category of data like "color", "population," or "Commons media" (files hosted on Wikimedia Commons). The value in the statement is the actual piece of data that describes the item.

Statements can also be expanded upon, annotated, or contextualized with the addition of optional qualifiers, references, and ranks.

Eigenschappen

Each property in Wikidata is assigned a pre-defined data type which restricts what can be added as its value. For example, only other items can be added as a value for the property "color", only numbers can be added for the property "population," and only multimedia files viewable on Wikimedia Commons can be added for the property "Commons media."

For more information on how to use properties, please see Wikidata:Properties.

Waarden

Meerdere waarden

If an item by nature can have properties with multiple values (like children of a person or official languages of a country), it is perfectly acceptable to add them.

If on the other hand an item ideally should have only one value (like the population of a city) but has multiple values (for example, because different sources report different numbers), all values may be added and additional qualifiers should be used. Qualifiers are used to further describe or refine the value of a property given in a statement. Please see Help:Qualifiers for more information.

Onbekend of geen waarde

There are times when an item has either no value or an unknown value for a given property. Depending on the property, these data values still provide important information about an item and should still be recorded in Wikidata. For example, we could say that Elizabeth I of England (Q7207) had no value for the child (P40) property, which is quite different than not recording anything at all. We could also say that William Shakespeare (Q692) has an unknown value for the date of birth (P569) property.

The majority of values in Wikidata will be custom values, and are entered in the usual fashion. Unknown values and no values are added to statements by clicking on the icon beside the value field that looks like this Wikidata snak icon.png.

Quantitative values

When adding quantitative values the following constraints should be noted. The largest positive integer number that Wikidata allows is 9e124+-0 and the largest negative number -9e124+-0. For floats one additional decimal place is supported 9,9e124+-0, but 9,91e124+-0 is not possible. The smallest positive and negative numbers are 1e-124+-0 and -1e-124+-0. For floats the exponent can only be 123 making this the smallest positive and negative floats: 1.0e-123+-0 and -1.0e-123+-0 (Note that the zero will be preserved as an indicator of the precision of the value. Compare this to entering 1e-123+-0).

Alleen controleerbare informatie toevoegen

Wikidata is not a database that stores facts about the world, but a secondary knowledge base that collects and links to references to such knowledge. This means that Wikidata does not state what the population of Germany actually is; it simply provides the information on what the population of Germany is according to a specific source, such as the The World Factbook (Q11191) CIA World Factbook.

As such, most statements should be verifiable by referenceable sources of information like a book, scientific publication, or newspaper article. In Wikidata, references are used to point to specific sources that back up the data provided in a statement. For more information, please see Help:Sources.

Meerdere meningen en consensus

Because statements essentially point to referenceable sources of information and different sources may provide contradicting information, it's possible to represent a plurality of perspectives on Wikidata.

In case of disputes, community consensus determines the value of a property, however other points of views can be added as additional values as long as they include a source and appropriate qualifiers. Ranks can also be used; if a consensus exists, it should be indicated by a preferred rank. For more information on ranks, please see Help:Ranking.

Please note that disputes should be discussed on the item's discussion page. Edit warring over values is not acceptable.

Doorverwijspagina's en andere Wikimedia-pagina's

When a Wikidata item refers to a Wikimedia page itself rather than to the subject of the Wikimedia page, the instance of (P31) property should be used to identify the type of page. This includes Category, Template and other pages outside the main namespace.

All disambiguation page items should have the statement 'instance of (P31) Wikimedia disambiguation page (Q4167410)'.

Voorbeelden:

item: Madonna (Q1564372)
instance of: Wikimedia disambiguation page (Q4167410)
item: list of lighthouses in Iceland (Q3253135)
instance of: Wikimedia list article (Q13406463)

Where a Wikipedia page covers more than one concept, object or thing use 'has part (P527)' to link to separate Wikidata pages for each of the individual concepts, objects or things.

Uitsluitingscriteria

Wikidata statements should be sourced and contain trustworthy neutral references.

Niet opgenomen worden:

Hoe voeg je verklaringen toe

Statements are added to an item page—in this case, for Marcel Bouix (Q16775650)—in the following way:

Scroll omlaag naar de sectie met verklaringen
Click on "add" at the very bottom of all other statements
In the new property field that appears, start typing the property
Select the property from the options that appear in the entity suggester
In the new field that appears to the right of the property, start typing the value. When done click "save"
The final statement will appear like this. To change or delete it, click "edit"

To add qualifiers, sources, or ranks, please see the appropriate help documentation listed at the bottom of the page.

Zie ook

Voor gerelateerde hulppagina's, zie:

  • Help:Properties, which explains what properties are and what rules they follow
  • Help:Sources, which explains what sources are and what rules they follow
  • Help:Qualifiers, which explains what qualifiers are and what rules they follow
  • Help:Ranking, which explains what ranks are and what rules they follow

Voor meer informatie en uitleg, zie:

  • Project chat, voor discussie over alles op Wikidata
  • Wikidata:Glossary, over termen die gebruikt worden op deze en andere hulppagina's
  • Help:FAQ, veelgestelde vragen die gevraagd en beantwoord werden door de Wikidata-gemeenschap
  • Help:Contents, het hulpportaal biedt alle documentatie die beschikbaar is over Wikidata