RosettaNet is an industry-driven e-business process standard that defines common inter-company public processes and their associated business documents. RosettaNet is based on the Service-Oriented Architecture (SOA) paradigm and all business documents are expressed in DTD or XML Schema. Our "ontologically-enhanced RosettaNet" effort translates RosettaNet business documents into a Web ontology language, allowing business reasoning based on RosettaNet message exchanges. This chapter describes this extension to RosettaNet and shows how it can be used in business integrations for better interoperability. The usage of Web ontology languages in RosettaNet collaborations can help accommodate partner heterogeneity in the setup phase and can ease the back-end integration, enabling for example more competition in the purchasing processes. It provides also a building block for a semantic SOA with discovery, selection and composition capabilities.