WSMO

WSMO or Web Service Modeling Ontology is a conceptual model for relevant aspects related to Semantic Web Services.
It provides an ontology based framework, which supports the deployment and interoperability of Semantic Web Services.
The WSMO has four main components:
The WSMO working group, part of the ESSI Cluster aligns the research and development efforts in the areas of Semantic Web Services between several European FP6 research projects.
WSMO working group includes the WSML working group, which aims at developing a language called Web Services Modeling Language (WSML) that formalizes the Web Services Modeling Ontology (WSMO).