I have taken the astrojet.h5 file and used it as the basis for a template xml file that, in conjunction with some Fortran code, allows me to view any symmetrical 3D array, i.e. NxNxN, in the same way as the astrojet code. This is good enough for me because in my application of interest the array is always symmetrical. The idea is that the Fortran code reads the template file, and uses it in combination with the array data to create another xml file that can then be opened with avOpen.
I mention this in case anyone else might have a use for such a capability. Anyone who'd like it is welcome to the code, and I can be contacted at firstname.lastname@example.org