등급은 서술의 여러 값 중 주석을 다는 방법입니다. 기본 등급은 "일반 등급"이며, 서술-값 쌍은 "선호 등급" 또는 "비사용 등급"을 가질 수 있습니다.
다른 속성들은 이상적으로 하나의 값만을 가져야 하겠지만, 역사적인 정보를 담기 위한 추가 정보를 담고 있을 수 있거나, 다른 관점에서의 값, 다른 단위로 계산된 값 등을 가지고 있을 수 있습니다. United States of America (Q30) 항목은 population (P1082) 속성을 하나 이상 가지고 있을 수 있습니다: 2005년의 것과 2013년의 것을 말이죠.
두 번째 예시에서, 2013년의 값만이 미합중국의 최신 인구 값에 대해 관심 있는 사람들을 위한 정보가 될 것입니다. 등급은 이러한 여러 서술의 값을 빠르게 구별할 수 있도록 도와주는 역할을 합니다.
쿼리에 관한 안내
이 기능이 적용된 후에, Development/Queries|쿼리 기능은 사용자가 위키데이터의 모든 값에 대해서 사전에 정의된 검색을 할 수 있도록 허용할 것입니다. 이러한 검색값은 복합적이고, 여러 조건을 기반으로 한 결과를 얻을 수 있도록 설정될 수 있습니다. 가능한 위키데이터의 쿼리로써 "100만명 이상이 거주하는 모든 도시" 라거나, "100만명 이상이 거주하는 일본의 도시에서 태어난 여성 화가" 를 쿼리할 수도 있을 것입니다.
이해하셨겠지만, 언제나 모든 쿼리를 돌릴 때 적절한 결과가 나오지 않을 것입니다. 따라서, 등급을 지정함으로써 어떤 값을 쿼리에 사용할 지 결정할 수 있도록 도와 줍니다.
등급이 아닌 것
Ranks should not be confused with references which are used to point to specific sources that back up the data provided in a statement. While a reference will ideally point to a reputable and established source of information, it's possible for a source to provide information that is incorrect or not as accurate as it could be. References merely state where a data value comes from; ranks indicate what data value is considered the most correct and, by extension, what values should be included in queries.
Ranks are not a way of asserting your view for a disputed value, but instead are used for communicating the consensus opinion for a statement. All disputes should be discussed on the item's discussion page. Edit warring over values is not acceptable.
Because ranks are used to differentiate multiple values for the same property, if a statement only has one value, it will have the default normal rank—there is no point adding the preferred rank in this situation.
There can be any number of statements with each rank, i.e. more than one value can be assigned the preferred rank.
The normal rank is assigned to all statements by default. A normal rank provides no judgement or evaluation of a value's accuracy and currency and therefore should be considered neutral.
Normal ranks are typically used for statements that contain relevant information that is believed to be correct, but may be too extensive to be shown by default. They are also used for statements with multiple values when it does not make sense to indicate that one value is "more correct" than any other.
For templates (for e.g. info boxes) and queries (once they are implemented), per default normal ranked values will be used for a property in cases when the property has no preferred rank.
- The item for Barack Obama has two values listed as children; both values should be given the normal rank because neither value is more "correct" than the other
- The item for Hillary Clinton has multiple values listed for the property position held (P39) including attorney at law, U.S. Senator, U.S. Secretary of State, and First Lady; all positions held in the past should be given the normal rank
The preferred rank is assigned to the most current statement or statements that best represent consensus (be it scientific consensus or the Wikidata community consensus).
Ideally, the preferred rank will be applied to sourced statements and/or statements with qualifiers which provide further details in support of the validity of their values, for example, through the use of qualifiers with the properties point in time (P585), determination method (P459), etc.
For templates and queries, per default preferred statement(s) for a property will be used if they exist, otherwise normal statement(s) will be used.
- An item of a city may feature a historic list of its mayors. The current mayor would receive the preferred rank.
- There may be several ways to measure the length of a river resulting in different results depending on to the method used. In such cases, the result of the most commonly used or scientifically valid method should receive the preferred rank.
The deprecated rank is used for statements that are known to include errors (i.e. data produced by flawed measurement processes, inaccurate statements) or that represent outdated knowledge (i.e. information that was never correct, but was at some point thought to be). It is often useful to indicate the reason for a deprecation with a reason for deprecation (P2241) qualifier. This does not apply to correct historical information, such as previous values of a statement, as long as they represent accurate information for the indicated time period. Such statements should instead be annotated with the apropriate start time (P580)/end time (P582) qualifiers.
Marking erroneous statements as deprecated instead of simply deleting such statements has three benefits:
- it allows other users to know not to re-add the value to the item
- it provides a mechanism for representing the evolution of theories and ideas and thereby creates a richer context for understanding human knowledge
- it upholds and establishes the integrity of Wikidata as a secondary knowledge base (that collects and links to references), rather than a primary database of facts. Wikidata simply provides information according to specific sources; those sources may or may not reflect contemporary thought or scientific consensus
For templates and queries, deprecated statements will never be used unless that is specifically requested.
- The earth being the center of the cosmos once was subject of scientific discourse which can be backed by references. However, the geocentric model is now deprecated.
How to apply ranks
Ranks are added on an item page under the Statements section.
- To add a rank to a statement, click on the  button
- Once in edit mode, the ranking mechanism will appear as small blue icon to the left of a statement's value (they appear as the same icons in grey when an item page is not being edited)
- Click on the icon and select either preferred rank, normal rank, or deprecated rank from the menu
- Check that the rank icon appears as it should:
- for a preferred rank;
- for a normal rank;
- for a deprecated rank
- Click on the [publish] button once done
For related Help pages, see:
- Help:Statements, which explains what statements 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:Deprecation, which explains justifying decisions to supersede and mark incorrect values
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