How to export attributes or annotations to an HDF5 file?

I'm trying to export attributes and annotations to an HDF5 file. But the documentation here is horrible and there are no examples of this.

I spent some time playing, but I can't get it to work. Here is the simplest example that should have helped me to get started:

Export["test.h5", {{{1, 2}, {2, 3}}, {{10, 11}, {12, 13}}}, {"Datasets", {"m1", "m2"}}]
r = Import["test.h5", "Rules"]
Export["test1.h5", r, "Rules"]

but it fails with:

Export::errelem: The Export element Dataset1 contains a malformed data structure and could not be exported to HDF5 format. >>
Export::noopen: Cannot open C:\Users\ajasja\Documents\test1.h5. >>

So my question is: How can one export attributes with datasets? (preferably using built in Mathematica functionality)

EDIT For reference here are some external MMA HDF5 packages that might provide the required functionality, but I have not yet managed to write any attributes:

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