XL (XML programming language)
Not to be confused with XL (programming language).
XL is an XML programming language for implementing Web Services. It was created in 2001 by Daniela Florescu (XQRL Inc.), Andreas Grünhagen and Donald Kossmann (ETH Zürich). XL is still under development and is based on the XML data model. It supports the W3C standards and uses XQuery as a query language, SOAP to communicate with other web services and WSDL to specify the interfaces.