WBXML
WAP Binary XML (WBXML) is a binary representation of XML. It was developed by the WAP Forum and since 2002 is maintained by the Open Mobile Alliance as a standard to allow XML documents to be transmitted in a compact manner over mobile networks and proposed as an addition to the World Wide Web Consortium's Wireless Application Protocol family of standards. The MIME media type application/vnd.wap.wbxml has been defined for documents that use WBXML. WBXML is used by a number of mobile phones.