XSD gripe 3 – Substitution groups

I may be missing something here, but I really don't understand what problem/ scenarios the substitution group feature is trying to solve. 

I am unclear why Substitution groups are even needed. If an element Foo is the same type or a derived type of an element Bar, it seems like that I should be able to freely substitute all I want without needing to statically declare the set. 

Comments (1)
  1. Michael Rys says:

    You are kidding? Right?

    Substitution groups allow you to model element content where you allow having differently named elements that have a related but different structure.

    How would you express that otherwise (without introducing another construct that may be even more complex)?

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