Integration of the MATHML specialization in SDL Knowledge Center 2016

Hello everyone,

I am currently using SDL Knowledge Center 2016 and would like to store a DITA XML topic that uses the MATHML specialization.
The problem is that the <DOCTYPE> in the header of the topic is not recognized and there is certainly a missing DTD file somewhere.
I suppose I should also integrate this specialization with DITA-OT to publish my PDF documents.

Has any of you ever integrated this specialization?
All help is welcome.

Best regards.
Sylvain