CBL

The Common Business Library (CBL) was originally developed by Veo Systems, Inc. and is now provided by Commerce One, Inc.  CBL 2.0 is a set of XML building blocks and a document framework that allows the creation of robust, reusable XML documents for electronic commerce. Using the CBL 2.0 document framework, businesses everywhere can conduct electronic commerce by seamlessly exchanging business documents of different types, resulting in frictionless commerce across multiple trading communities. To enable companies to preserve their investment in existing standards such as traditional Electronic Data Interchange (EDI), CBL 2.0 provides a transition path to XML-based commerce capability. CBL V2.0 is available in three different schema languages: Microsoft's XML Data Reduced (XDR), the World Wide Web Consortium's (W3C) XML Schema Definition Language (XDSL), and Commerce One's Schema for Object-oriented XML (SOX)." 

CBL is based on a number of industry standards.  While CBL V2.0 has been endorsed by a number of standards organizations ( BizTalk, OASIS, the UN/CEFACT Techniques and Methodologies Working Group, and CommerceNet and its eCo Framework Project and Working Group.), it is important to note that CBL was developed by a single vendor.  Although highly popular, CBL should not be considered to be a true standard itself.