Predictive Model Markup Language (PMML) was released in 1997 to solve a very similar problem (but for lots of predictive models). I don't know that it ever really caught on. That was also promoted by the tool builders but not by the users.

While checking the wikipedia page, I'm surprised to see that it is still being developed (with a 2016 release): https://en.wikipedia.org/wiki/Predictive_Model_Markup_Langua...

Please note that in 1997 it was NOT ridiculous to use XML for this.