store/[org.clojure/clojure "1.9.0"] clj::clojure.core/.

Official Documentation

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Usage
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   (.instanceMember instance args*)
   (.instanceMember Classname args*)
   (Classname/staticMethod args*)
   Classname/staticField

Docstring
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  The instance member form works for both fields and methods.
  They all expand into calls to the dot operator at macroexpansion time.

Source

;; Special forms have no source