# Introduction

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.