syntheticpersonYep, understood completely.
I'm doing this out of necessity. I have assets that were look-dev-ed in Maya Arnold, and I want them in Houdni 19 Material X.
I see from https://docs.arnoldrenderer.com/display/A5AFMUG/MaterialX [docs.arnoldrenderer.com] that it's a bit of a mess where there are nodedef extensions and special conditions/etc: no doubt designed to support 1:1 translation of arnold materials to it's mtlx input interface, as well as support reading standard mtlx nodes. They appear unconcerned about using MtlX as an interchange format.