The Zend_Server family of classes provides functionality for the various server classes, including Zend_XmlRpc_Server, Zend_Rest_Server, Zend_Json_Server and Zend_Soap_Wsdl. Zend_Server_Interface provides an interface that mimics PHP 5's SoapServer class; all server classes should implement this interface in order to provide a standard server API.

The Zend_Server_Reflection tree provides a standard mechanism for performing function and class introspection for use as callbacks with the server classes, and provides data suitable for use with Zend_Server_Interface's getFunctions() and loadFunctions() methods.