"The eCatalog XML (eCX) specification was developed to solve the problem of electronic catalog interoperability. The data type definition (DTD) deals exclusively with the description and definition of a catalog structure, or schema, and its associated items. eCX is currently used by Requisite Technology and its Partners for eCatalog Exchange. . . eCX was developed in the fall of 1998 to address the problem of exchanging product information and catalog structure between different catalog systems. It was developed by Requisite Technology and is used by Requisite and its partners for catalog interoperability. . . Electronic Catalog XML (eCX) is a data type definition (DTD) that provides a method for electronic catalog interoperability. It is unique because it deals with the difficult problem of dynamic categorization and attributes in electronic catalogs. It also provides a method to 'inform' a catalog loading software of actions to take to update a catalog's structure and product information... just as with all other XML data type definitions such as cXML and CBL, eCX is not an official' standard. Requisite Technology is a member of OAG and is working on the catalog committee to develop a standard XML DTD that enables true, vendor-neutral, catalog interoperability."