show how to use derived struct

[qicosmos]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.60 🎉

Comparison is base (4a329a7) 43.78% compared to head (c740ed5) 44.38%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #172      +/-   ##
==========================================
+ Coverage   43.78%   44.38%   +0.60%     
==========================================
  Files          36       37       +1     
  Lines        6512     6714     +202     
==========================================
+ Hits         2851     2980     +129     
- Misses       3661     3734      +73     

Impacted Files	Coverage Δ
example/xml_example.cpp	0.00% <0.00%> (ø)

... and 10 files with indirect coverage changes

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