Thank you Trevor!
I was just confused, looking at the RealEstate schema example in the welcome_4_1_1 database, that has doctypes for both a person and property. I thought one had to define all doctypes in one schema, which I would find extremely frustrating, come time to update it! 
I come from a pretty schema-less environment, MSXML with xml files, so I need to adjust!
Peter
#webMethods#API-Management#Tamino