This book is a collection of notes and sample codes written by the author while he was learning WSDL himself. Topics include introduction to WSDL (Web Services Definition Language); WSDL document structure; ''types'', ''interface'', ''binding'' and ''service'' definition elements; differences between style=''rpc'' and style=''document''; using WSDL document with SoapUI; parsing WSDL documents with Python, PHP, Perl, and Java programs. Updated in 2024 (Version v2.22) with Python tutorials.For latest updates and free sample chapters, visit https://www.herongyang.com/WSDL.