Go to New Advent and read about it.
I have. It was posted here.
New Advent says it is dogmatic, all of it.
The document has some doctrine in it but the whole letter is not treated as infallible even though there is nothing wrong with it.
Well, Scottbot, or another RC said there is no way to know if anything is ex cathedra.
Just about every Roman Catholic gives a different answer.
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