Is the identification function predefined in the Schema?
Yes, but it is called values . In fact, this is usually used for multiple values, so it is a generalized multi-valued identification function.
values
In DrRacket, I know identity works. For example, (identity 12) => 12
identity
(identity 12) => 12
Source: https://habr.com/ru/post/1339368/More articles:Exit task list in batch file? - fileTomcat displays expanded application name instead of war file - loggingOptional / Optional Query String Parameters in WCF URI Pattern - c #Dates in php sunday & saturday? - dateDelete array element in mongoDB based on element position - arraysMongoDB array element from collection - arraysmysql GIS (a point inside a polygon and a series of points) - mysqlAdd calendar event in android app - androidCombine multiple room availability requests into one - mysqlChecksum in UDP Datagram Socket + java - javaAll Articles