Enforce deterministic order in RDFA

[AdrianAtZyte]

Fixes #146.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.79%. Comparing base (a31daaa) to head (de2b9f8).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #256      +/-   ##
==========================================
+ Coverage   89.62%   89.79%   +0.17%     
==========================================
  Files          13       13              
  Lines         636      647      +11     
  Branches      138      143       +5     
==========================================
+ Hits          570      581      +11     
  Misses         54       54              
  Partials       12       12              

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