Referendums are usually votes with a yes or no answer to a text in the form of a question. That is, a binary and exclusive answer. Sometimes the form of the question forces to have a different text for the answer, such as remain / leave, in the case of Brexit. The ontology properties of a binary referendum are similar to an election, except:
Specific territory object of the referendum.
In Infobox: Territory flag is shown at bottom bar with election serie. It gets flag image (P41) from "jurisdiction" item.
Previous elections for same type and same jurisdiction.
In Infobox: IMPORTANT: It is used in all calculations of differences in results. It is shown in the bottom bar with the series. If the name contains a 4 digits year, it will show as a link.
2016 United Kingdom European Union membership referendum
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Unique referendum date. It may be replaced by a combination of start time (P580) + end time (P582), when there is a voting period.
In infobox: At the beginning, in the general data. An icon is also displayed next to it, highlighting if they are just called (), we're in campaign () or today is the election day ().
2016 United Kingdom European Union membership referendum
File:United Kingdom EU referendum 2016 area results.svg
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Map or graph representative of the result. As it is a multivalued property, it must be accompanied by the qualifier P518 = electoral result (Q19571328), for it to be treated by the infobox.