Linked USDL is an RDF(S) vocabulary that aims to better promote and support the trading of services on the Web. The kinds of services targeted for coverage by USDL include human services (e.g., consultancy), business services (e.g. purchase order requisition), software services (e.g., WSDL and RESTful services), infrastructure services (e.g., CPU and storage services), etc.
Linked USDL is a remodelled version of USDL (an earlier initiative from SAP Research), that builds upon the Linked Data principles and the Web of Data. This effort is therefore most concerned with remodelling the existing USDL specification as an RDF(S) vocabulary that could better support machines in trading services on the Web. To maximise the potential interoperability Linked USDL adopts, where possible, existing RDF(S) vocabularies such as GoodRelations, the Minimal Service Model and DC Terms to name a few. Linked USDL is inline with other Linked Data centric initiatives around services such as the work on Linked Services.
The work on Linked USDL was initiated within the W3C USDL Incubator Group as a joint effort between the Knowledge Media Institute of The Open University, and SAP Research. Since then, several institutions are using and contributing to Linked USDL, including for instance the University of Coimbra, the University of Seville, and the University of Lyon among others.
For more details about Linked USDL see www.linked-usdl.org or have a look at the presentation I gave about it during ESWC.
Pedrinaci, C., Cardoso, J. and Leidig, T. (2014) Linked USDL: a Vocabulary for Web-scale Service Trading, 11th Extended Semantic Web Conference (ESWC 2014), Springer.