blocks|key|1138423|text|SOAP代表简单(sic)对象访问协议。它的目的是通过HTTP发送XML来实现对远程对象的远程过程调用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1138424|WSDL是Web服务描述语言。对端点的请求以“.wsdl”结尾，将产生一条描述用户可以预期的请求和响应的XML消息。它描述了服务与客户之间的契约。|1138425|REST使用HTTP向服务发送消息。|1138426|SOAP是一种规范，REST是一种风格。|1138427|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

SOAP stands for Simple (sic) Object Access Protocol. It was intended to be a way to do Remote Procedure Calls to remote objects by sending XML over HTTP. 

WSDL is Web Service Description Language. A request ending in '.wsdl' to an endpoint will result in an XML message describing request and response that a use can expect. It descibes the contract between service &amp; client.

REST uses HTTP to send messages to services. 

SOAP is a spec, REST is a style.

blocks|key|1138474|text|你不会“简单地”理解一些复杂的东西。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1138475|WSDL是一种基于XML的语言，用于描述web服务。它描述了服务使用的消息、操作和网络传输信息。这些web服务通常使用SOAP，但也可能使用其他协议。|1138476|WSDL是程序可读的，因此可以用来生成调用web服务所需的全部或部分客户端代码。这就是将基于SOAP的web服务称为“自描述”的含义。|1138477|REST与WSDL一点关系都没有。|1138478|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

You're not going to "simply" understand something complex.

WSDL is an XML-based language for describing a web service. It describes the messages, operations, and network transport information used by the service. These web services usually use SOAP, but may use other protocols.

A WSDL is readable by a program, and so may be used to generate all, or part of the client code necessary to call the web service. This is what it means to call SOAP-based web services "self-describing".

REST is not related to WSDL at all.

blocks|key|924058|text|WSDL是描述web服务的XML文档。它实际上代表Web服务描述语言。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|924059|SOAP是一种基于XML的协议，它允许您在应用程序之间通过特定的协议(例如，可以是HTTP或SMTP+)交换信息。它代表简单对象访问协议(+Simple+Object+Access+Protocol+)，并使用XML作为其消息传递格式来中继信息。|924060|REST是一种网络系统的架构风格，代表表述性状态转移。它本身不是一个标准，但确实使用了HTTP、URL、XML等标准。|924061|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

A WSDL is an XML document that describes a web service. It actually stands for Web Services Description Language.

SOAP is an XML-based protocol that lets you exchange info over a particular protocol (can be HTTP or SMTP, for example) between applications. It stands for Simple Object Access Protocol and uses XML for its messaging format to relay the information.

REST is an architectural style of networked systems and stands for Representational State Transfer. It's not a standard itself, but does use standards such as HTTP, URL, XML, etc.

blocks|key|1138564|text|维基百科说“Web服务描述语言是一种基于XML的语言，它提供了一个描述Web服务的模型”。换句话说，WSDL之于web服务，就像javadoc之于java库。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1138565|不过，WSDL的真正好处在于，软件可以使用WSDL生成客户端和服务器。|1138566|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Wikipedia says "The Web Services Description Language is an XML-based language that provides a model for describing Web services". Put another way, WSDL is to a web service, as javadoc is to a java library. 

The really sweet thing about WSDL, though, is that software can generate a client and server using WSDL.

blocks|key|924136|text|一些清晰的解释(对于SOAP和WSDL)也可以在这里找到。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|924137|Difference+between+a+SOAP+message+and+a+WSDL?|offset|length|924138|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/14541066/difference-between-a-soap-message-and-a-wsdl^0|0|0|19|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

Some clear explanations (for SOAP and WSDL) can be found here as well.

<a href="https://stackoverflow.com/questions/14541066/difference-between-a-soap-message-and-a-wsdl">Difference between a SOAP message and a WSDL?</a>

blocks|key|1138693|text|REST在编码方面是轻量级的，更适用于轻量级设备，即非严格的API。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1138694|REST是独立于格式的。XML、HTML、JSON所有选项都可用。|1138695|REST提供了两点消息传输的能力(这并不奇怪，因为REST代表WSDL+Transfer)，其中REpresentational+/SOAP交互是多点消息交互。|1138696|REST不需要XML消息的新扩展，在WSDL/SOAP中就是这样。|1138697|WSDL/SOAP使用多种传输协议，而REST仅依赖于HTTP。因此，WSDL/SOAP可以像RESTful方式一样使用，但是简单的请求可能过于复杂/权重过大。|1138698|一个简单的比喻:休息就像一个汽车工给你送食物，又容易又快。XML扩展的WSDL/SOAP更像UPS交付，更结构化和严肃的东西，但也有成本。|1138699|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|P|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|Q|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|R|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|S|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|M|$]]

REST is light-weight in terms of encoding, much more useful for light weight devices i.e. non strict APIs.

REST is format independent. XML, HTML, JSON all options are available.

REST provides abilities for on 2 point message transfer (not surprising since REST stands for REpresentational State Transfer) where WSDL/SOAP interaction is multiple point message interaction.

REST does not require a new extension for XML messages, where in WSDL/SOAP this is the case.

WSDL/SOAP uses multiple transport protocols, REST relies on only HTTP. Therefore WSDL/SOAP can be used like a RESTful way, however simple requests can be overly complicated/heavy weighted.

A simple analogy: REST is like a motoboy delivers your food easy and quick. XML extended WSDL/SOAP more like UPS delivery, more structured and serious stuff but comes with a cost.

blocks|key|924306|text|SOAP、->、SOAP(Simple+object+access+protocal，简单对象访问协议)是为机器与机器交互创建的应用层协议。协议定义了标准规则。使用特定协议的所有各方都应遵守协议规则。像TCP一样，它在传输层展开，SOAP协议将被应用层(任何支持SOAP+-+Axis2、.Net的应用程序)所理解。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|924307|WSDL消息由->+->SoapHeader和SoapBody组成。它没有定义什么是消息格式？它支持的所有传输协议(HTTP、JMS)是什么？没有这些信息，任何想要使用特定web服务的客户端都很难构造SOAP消息。即使他们这样做了，他们也不会确定，它会一直起作用。WSDL就是救星。WSDL+(Web服务描述语言)定义了SOAP消息的操作、消息格式和传输细节。|924308|REST+->+REST(表述性状态转移)基于传输。与以操作为目标的SOAP不同，REST更关注资源。REST通过使用URL+(例如-http://{serverAddress}/employees/employeeNumber/12345)来定位资源，并且它依赖于传输协议(使用HTTP+-+GET、POST、PUT、DELETE等...)要在资源上执行的操作。REST服务根据URL定位资源，并根据传输操作谓词执行操作。它更多的是基于架构风格和约定。|offset|length|924309|entityMap|0|LINK|mutability|MUTABLE|url|http://{serveraddress}/employees/employeeNumber/12345^0|0|0|1V|1H|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@$F|S|G|T|1|U]]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

SOAP -> SOAP(Simple object access protocal) is the application level protocal created for machine to machine interaction. Protocol defines standard rules. All the parties who are using the particular protocol should adhere to the protocol rules. Like TCP, It unwinds at transport layer, The SOAP protocol will be understood by Application layer( any application which supports SOAP - Axis2, .Net). 

WSDL -> SOAP message consist of SoapEnevelope->SoapHeader and SoapBody. It doesn't define what would be message format? what are all the transports(HTTP,JMS) it supports? without this info, It is hard for any client who wants to consume the particular web service to construct the SOAP message. Even if they do, they won't be sure, it'll work all the time. WSDL is the rescue. WSDL (Web Service description Language) defines the operations, message formats and transport details for the SOAP message. 

REST -> REST(Representational state transfer) is based on the Transport. Unlike SOAP which targets the actions, REST concerns more on the resources. REST locates the resources by using URL (example -http://{serverAddress}/employees/employeeNumber/12345) and it depends on the transport protocol( with HTTP - GET,POST, PUT, DELETE,...) for the actions to be performed on the resources. The REST service locates the resource based on the URL and perform the action based on the transport action verb. It is more of architectural style and conventions based.

blocks|key|1138818|text|WSDL文档描述了WSDL服务。它使用以下主要元素指定服务的位置和服务的方法:在webservice中使用的数据类型每个操作的数据元素描述可执行的操作和包含的消息|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1138819|SOAP+(简单对象访问协议)是一种消息传递协议，它允许运行在不同操作系统上的程序使用http和xml进行通信。|1138820|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

A WSDL document describes a webservice. It specifies the location of the service and the methods of the service using these major elements:
 data types using in webservice
 data elements for each operation
 describe the operations that can be performed and the messages envolved


SOAP (Simple Object Access Protocol) is a messaging protocol that allows programs that run on disparate operating systems to communicate using http and xml.

What is <a href="https://www.w3.org/TR/wsdl" rel="nofollow noreferrer">WSDL</a>? How is it related to <a href="https://www.w3.org/TR/soap12" rel="nofollow noreferrer">SOAP</a>? Where does <a href="https://www.rfc-editor.org/rfc/rfc6690" rel="nofollow noreferrer">REST</a> fit in all of that?

问什么是WSDL、SOAP和REST？
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