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Can we change the DTD for a topic?

Newbie

Can we change the DTD for a topic?

When I open a topic, find some red alarm, and blue font with purple background.

red.jpg

Why?

I think it's the problem of DTD?

When I open a topic, which DTD I use? How can I check which DTD I used?

Can we change the DTD for a topic?

Thanks!