SOAP 1.1 Interoperability testing done with all major implementations Script based Client and Server RPC/Encoded and Document/Literal HTTP, HTTPS, able to add other transports Supports 1999/2001 Schema WSDL Generation/Support Not part of PEAR (good/bad?) Better Schema support than PEAR::SOAP (?) XML de/serialization more optimized than PEAR::SOAP SOAP 1.2 support not finished (?) No Attachment support (?) Probably not good for long running processes PHP 4 Object support No streaming XML pull parser Written entirely in script