SOAP 1.1 Interoperability testing done with all major implementations Script based Client and Server RPC/Encoded and Document/Literal HTTP, HTTPS, TCP and SMTP Email Server and Gateway Supports 1999/2001 Schema WSDL Support WSDL and DISCO Generation SOAP with Attachments (Mime) DIME Support SOAP 1.2 support not finished Not good for long running processes Chews up memory PHP 4 Object support No streaming XML pull parser (yet) Written entirely in script