ordering of #answer and #solution

[David Austin]

In cleaning up the ULA source, I found that the schema enforces an ordering of #answer and #solution elements inside a #task.  So the following is valid:

<task>

  <answer> .. </answer>

  <solution> .. </solution>

</task>

but 

<task>

  <solution> .. </solution>

  <answer> .. </answer>

</task>

is not.  It felt more natural to me to write solutions and then append shorter answers so I'm wondering if this is intentional.  My assistant says the order doesn't affect processing. I can easily fix the 386 (!) violations, but I'm wondering about newer authors who may be confused since the validation report just says that 'element "answer" not allowed here.'

David

[David Austin]

Similarly, a #caption must come before #image inside a #figure.  ULA has 260 violations from the ordering requirement!  

[Oscar Levin]

This should be a relatively easy change in the schema, assuming there isn't a semantics or code reason to keep enforcing this.

Rob, would you like a PR?

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