Excluding math types?

[mattgarrish]

Isn't it possible that a book could have mathml and latex equations, or some mathml and some described images?

The rich content output strings start with an if/else if/ else if for the math possibilities, so only one can occur. The same isn't done for the different chemistry types.

Should these be switched so they are all "if" checks?

[mattgarrish]

Reopening as this also occurs in the onix techniques