Bug present in 10.0.2 or earlier, and fixed in 10.4

If I try to export this toy code as ExpressionML or just XML:

data1 = {1, 2, 3, Plot[x, {x, 0, 10}]};
str1 = ExportString[data1, "ExpressionML"];

I have no problem. Executing it, I get as expected:

ok example

But if I try to export some expression containing as Association like this:

data2 = {1, 2, 3, <|"a" -> 4, "b" -> 5|>};
str2 = ExportString[data2, "ExpressionML"];

I get:

enter image description here

So, I can't export Associations. This is a bug no? Tested in Mathematia 10.0.2 for MAC.


A very clumsy workaround that I did was:

data3={1,2,3,<|"a"-> 4,"b"-> 5,"c"-><|"a"-> 4,"b"-> 5|>|>};
str3=ExportString[data3/.Association-> AssociationTemp,"ExpressionML"];
ImportString[str3]/.AssociationTemp-> Association

Note that for nested Associations, Replace works properly just from V10.0.2

  • $\begingroup$ Looks like a bug indeed. A job for [email protected] I'd say. $\endgroup$ Dec 27, 2014 at 21:33
  • $\begingroup$ @SjoerdC.deVries I sent a formal report about it. $\endgroup$
    – Murta
    Dec 28, 2014 at 2:18
  • $\begingroup$ What are you using ExpressionML for? $\endgroup$
    – Szabolcs
    Apr 1, 2015 at 21:36
  • $\begingroup$ @Szabolcs to exchange code using the web between two Mathematicas. I did a rest service using WebMathematica, that another Mathematica can read. $\endgroup$
    – Murta
    Apr 1, 2015 at 23:14
  • 1
    $\begingroup$ @AlbertRetey at the time of this question, I was making some experiments transferring information between webMathematica servers. So I user expStr = ToString@FullForm[someExpression] to create the expression in string format, send it over Rest, and ToExpression@expStr in the other side to transform it back into Mathematica code. $\endgroup$
    – Murta
    Nov 17, 2015 at 12:14

1 Answer 1


This bug has been fixed as of version 10.4.0.

data2 = {1, 2, 3, <|"a" -> 4, "b" -> 5|>};
str2 = ExportString[data2, "ExpressionML"];

(* {1, 2, 3, <|"a" -> 4, "b" -> 5|>} *)

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