How to get BPM schema?

Hi ,

Due some company restriction we need to comunicate the BPM and BSM (9.26 both) through Access Gateway (middleware).

As far I know till now, this not a problem (correct me if I'm wrong). But of course , we need to implement the proper services to forward the informacion from BPM to BSM and viceversa. 

We think that if we can get the BPM schema and just include it in the middleware part , everything is solved. Therefore, I'd like to know if the proper schema with all the operation necessaries and all the info about BPM is the one we can get in localhost:2696/.../BPMApi.wsdl


Regards and thanks in advance