Fix max_occur for dtd choice content types

[tefra]

📒 Description

Fix max_occur for dtd choice content types

Resolves #759

🔗 What I've Done

Write a description of the steps taken to resolve the issue

💬 Comments

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🛫 Checklist

• Updated docs
• Added unit-tests
• Sample tests pass
• W3C tests pass

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Base: 99.98% // Head: 99.98% // No change to project coverage 👍

Coverage data is based on head (f62780d) compared to base (f3b4253).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #760   +/-   ##
=======================================
  Coverage   99.98%   99.98%           
=======================================
  Files         101      101           
  Lines        8855     8859    +4     
  Branches     1964     1965    +1     
=======================================
+ Hits         8854     8858    +4     
  Partials        1        1           

Impacted Files	Coverage Δ
xsdata/codegen/mappers/dtd.py	100.00% <100.00%> (ø)

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