This is an example of user defining a Type (PostalAddress), which is a container, and using it as a composite attribute in the DataModel (<PostalAddress name="VendorAddress"/>). By using this type, the DataModel will have attributes of:
VendorInfo.VendorAddress.Street
VendorInfo.VendorAddress.City
VendorInfo.VendorAddress.Zipcode
Using composite attributes
Def(Name: "PostalAddress"): String(name: "Street"); String(name: "City"); String(name: "Zipcode"); DataModel(Name: "VendorInfo"): Sid(name: "VendorSysId"); String(name: "vendorName"); String(name: "vendorTitle"); PostalAddress(name: "VendorAddress"); String(Name: "DeviceTypes", Cardinality: "0..m");