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In computer science, a type system is nominal (also called nominative or name-based) if compatibility and equivalence of data types is determined by explicit declarations and/or the name of the types. Nominal systems are used to determine if types are equivalent, as well as if a type is a subtype of another.
Nominative and structural type systems are: Nominative type system. Structural type system. The differences between nominative and structural type systems are discussed in: Type system. Subtyping. Categories: Disambiguation pages. Data types. Type theory.
Structural systems are used to determine if types are equivalent and whether a type is a subtype of another. It contrasts with nominative systems, where comparisons are based on the names of the types or explicit declarations, and duck typing, in which only the part of the structure accessed at runtime is checked for compatibility.
In computer programming, a type system is a logical system comprising a set of rules that assigns a property called a type (for example, integer, floating point, string) to every term (a word, phrase, or other set of symbols).
An important attribute of every type system is whether they are structural or nominal, they can even be mixed within a single type system. So it’s important to know the difference. A...
In grammar, the nominative case (abbreviated NOM), subjective case, straight case, or upright case is one of the grammatical cases of a noun or other part of speech, which generally marks the subject of a verb, or (in Latin and formal variants of English) a predicative nominal or adjective, as opposed to its object, or other verb arguments ...
In short: whether a type system is explicit or implicit is a property of static systems. It is a completely different question from whether a type system is dynamic or static. Often, you have type systems that are at times explicit and at times implicit. For example, I believe C# lets you infer types using the var keyword.
