(r5rs.info.gz) Naming conventions

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(r5rs.info.gz) Notation and terminology

 
 1.3.5 Naming conventions
 ------------------------
 
 By convention, the names of procedures that always return a boolean
 value usually end in "`?'".  Such procedures are called predicates.  
 
 By convention, the names of procedures that store values into previously
 allocated locations (see section  Storage model) usually end in
 "`!'".  Such procedures are called mutation procedures.  By convention,
 the value returned by a mutation procedure is unspecified.
 
 By convention, "`->'" appears within the names of procedures that take
 an object of one type and return an analogous object of another type.
 For example, `list->vector' takes a list and returns a vector whose
 elements are the same as those of the list.
 

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(r5rs.info.gz) Notation and terminology