documentation enhanced

[dapper91]

• document type declaration example added.
• sub-model namespace inheritance documented.

Fixes the issue.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.08%. Comparing base (b918ae7) to head (7d646af).
Report is 34 commits behind head on dev.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #256      +/-   ##
==========================================
+ Coverage   91.89%   92.08%   +0.18%     
==========================================
  Files          29       29              
  Lines        1617     1680      +63     
==========================================
+ Hits         1486     1547      +61     
- Misses        131      133       +2     

Flag	Coverage Δ
unittests	92.08% <ø> (+0.18%)	⬆️

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