This free Web service tutorial book is a collection of notes and sample codes written by the author while he was testing free Web services available on the Internet. Topics include Web service, SOAP, REST, WSDL, WADL, soapUI, Country codes, currencies, airports, weather, bar codes, mortgage, stock quotes, search, Yahoo, Flickr.

A collection of commonly used file extensions with detailed description of their file types, formats and samples.

This tutorial provides tutorial examples and notes on socket communication. Topics include the socket communication interface model; built-in functions for socket communication server and client; using listen() and accept() functions to play the server role; using connect() to play the client role.

This is a free tutorial book for XML beginners. It is a collection of notes and sample codes written by the author while he was learning XML and related technologies. Topics include DOM, DTD, J2SDK, Java, SAX, Syntax, Templates, XML, XPath, XSD, XSL, XSLT, XSL-FO.