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En Wikidata, un concepto, tema ou obxecto esta representado por un elemento, e cada elemento ten a súa propia paxina. Unha declaración indica como queda rexistrada en Wikidata a información que sabemos sobre un elemento, é dicir, os datos que temos sobre el. Isto faise emparellando unha propiedade e polo menos un valor; esta parella é o corazón da declaración. As declaracións poden ampliarse, comentarse ou contextualizarse con valores adicionais, como tamén con cualificadores, referencias e rangos opcionais. As declaracións serven tamén para conectar uns elementos con outros, conseguindo así unha estrutura de datos ligados.

Language item property Valor
inglés Marie Curie occupation physicist
alemán Marie Curie Tätigkeit Physiker
francés Marie Curie occupation physicien
polaco Maria Skłodowska-Curie zajęcie fizyk
galego Marie Curie ocupación físico
  Q7186 P106 Q169470


Por exemplo, para incluír a información sobre a ocupación de Marie Curie en Wikidata, tería que engadir unha declaración no elemento sobre ela, Marie Curie (Q7186). Utilizando a propiedade, occupation (P106), pode engadir o valor physicist (Q169470), e tamén o valor chemist (Q593644). Fíxese que tanto "químico" como "físico" teñen as súas propias páxinas en Wikidata, o que permite que Marie Curie estea ligada a eses elementos.

Principios xerais independentes da lingua

Visión xeral dunha declaración de Wikidata
exemplo dunha declaración sinxela consistente nunha parella propiedade-valor
exemplo dunha declaración consistente en diversos valores para unha propiedade
exemplo dunha declaración complexa consistente nunha parell apropiedade-valor, cualificadores, e unha referencia

Unha declaración consistente nunha parella propiedade-valor, por exemplo "localización:Alemaña".

A propiedade nunha declaración describe o valor dos datos; é semellante a unha categoría de datos como "color", "poboación" ou "multimedia Commons" (ficheiros aloxados en Wikimedia Commons). O valor da declaración é o fragmento de datos que de feito describe ó elemento.

As declaracións poden ampliarse, comentarse ou contextualizarse engadindo cualificadores, referencias e rangos opcionais.


En Wikidata, cada propiedade ten asignado uns tipos de datos predefinidos, que limitan os valores que se poden engadir. Por exemplo, á propiedade "Cor" só se lle pode engadir un valor de texto, á propiedade "Poboación" só se lle pode engadir un valor numérico, e só se poden engadir formatos de ficheiro á propiedade "Multimedia Commons".

Para máis información sobre como utilizar as propiedades, por favor, consulta Wikidata:Properties.


Valores múltiples

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.

Unknown or no values

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).

Add only verifiable information

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.

Plurality and 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.

Disambiguation and other non-item Wikimedia pages

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)'.


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.

Exclusion criteria

Wikidata statements should be sourced and contain trustworthy neutral references.

The following types of information should not be added as Wikidata statements:

Adding statements

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

Scroll down to the Statements section
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.

See also

For related Help pages, see:

  • 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
  • Help:QuickStatements, which explains how to add statements in batches using QuickStatements tool

For additional information and guidance, see:

  • Project chat, for discussing all and any aspects of Wikidata
  • Wikidata:Glossary, the glossary of terms used in this and other Help pages
  • Help:FAQ, frequently asked questions asked and answered by the Wikidata community
  • Help:Contents, the Help portal featuring all the documentation available for Wikidata