The proliferation of different standards and joint
initiatives for the classification of products and
services (UNSPSC, e-class, RosettaNet, NAICS,
SCTG, etc.) reveals that B2B markets have not
reached a consensus on coding systems, level of
detail of their descriptions, granularity, etc. This
paper shows how these standards and initiatives,
which are built to cover different needs and
functionalities, can be integrated using a common
multi-layered knowledge architecture through
ontological mappings. This multi-layered ontology
will provide a shared understanding of the domain for
applications of e-commerce, allowing information
sharing and interoperation between heterogeneous
systems. We will present a tool called WebPicker and
a method for integrating these standards and
initiatives, enriching them and obtaining the results in
different formats using the WebODE platform. As an
illustration, we show a case study on the computer
domain, presenting the ontological mappings
between UNSPSC, e-class, RosettaNet and an
electronic catalogue from an e-commerce platform