Commerce XML (cXML) is a standard for the online exchange of business transaction information in common formats. It defines the structure of purchase orders, order acknowledgements, and other core e-business documents. cXML is a document type definition (DTD) based on XML tags that defines fields for a specific type of document, like a purchase order. The XML structure enables an application program to easily extract data and deliver it to another application program.
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Online catalog company Ariba Technologies led the cXML effort, but more than 40 companies collaborated on cXML, including Hewlett-Packard and Microsoft. The organizations hoped a common standard would reduce the cost of doing business online. The first version of cXML (version 0.91) appeared in May 1999.