gnu: Add julia-dataapi.

* gnu/packages/julia-xyz.scm (julia-dataapi-1.1.0): New variable.

gnu/packages/julia-xyz.scm

@@ -445,3 +445,28 @@ adds @code{isiterable} and @code{getiterator} to the iterator interface.")
     (description "@code{TableTraits} defines a generic interface for tabular
 data.")
     (license license:expat)))
+
+(define-public julia-dataapi
+  (package
+    (name "julia-dataapi")
+    (version "1.1.0")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/JuliaData/DataAPI.jl")
+             (commit (string-append "v" version))))
+       (file-name "DataAPI")
+       (sha256
+        (base32 "0zl9vwkwcd2zar7vn9mhdwysyzkkfmq4ls5cmfs2nqzlfv4bzwbx"))))
+    (build-system julia-build-system)
+    (home-page "https://github.com/JuliaData/DataAPI.jl")
+    (synopsis "Data-focused namespace for packages to share functions")
+    (description "This Julia package provides a namespace for data-related
+generic function definitions to solve the optional dependency problem;
+packages wishing to share and/or extend functions can avoid depending directly
+on each other by moving the function definition to @code{DataAPI.jl} and each
+package taking a dependency on it.  As such, it is paramount for
+@code{DataAPI.jl} to be as minimal as possible, defining only generic function
+stubs and very little else.")
+    (license license:expat)))