The Oracle Enterprise Metadata Manager (EMM) is a product of the Oracle Corporation that provides an ISO/IEC 11179 metadata registry.
This product is significant because it is one of the first commercial products that includes a metadata registry in an application server. Registering metadata is one of the first steps in metadata publishing which in turn is one of the foundational elements of the Semantic Web.
EMM currently runs on the following Oracle products
EMM is being ported to Oracle 9iAS Release 2 and 10gAS .