The optional SOAP Header element contains header information.
可选择的SOAP标题元素包含了头部信息。

The SOAP Header Element
SOAP Header 元素

The optional SOAP Header element contains application specific information (like authentication, payment, etc) about the SOAP message. If the Header element is present, it must be the first child element of the Envelope element.
可选的 SOAP Header 元素可包含有关 SOAP 消息的应用程序专用信息（比如认证、支付等）。如果 Header 元素被提供，则它必须是 Envelope 元素的第一个子元素。

Note: All immediate child elements of the Header element must be namespace-qualified.
注意：所有 Header 元素的直接子元素必须是合格的命名空间。

<?xml version="1.0"?>
<soap:Envelope
xmlns:soap="http://www.w3.org/2001/12/soap-envelope"

soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding">

<soap:Header>
<m:Trans
xmlns:m="http://www.w3schools.com/transaction/"
soap:mustUnderstand="1">234</m:Trans>
</soap:Header>

...
...

</soap:Envelope>

The example above contains a header with a "Trans" element, a "mustUnderstand" attribute value of "1", and a value of 234.
上面的例子包含了一个带有一个 "Trans" 元素的头部，它的值是 234，此元素的 "mustUnderstand" 属性的值是 "1"。

SOAP defines three attributes in the default namespace ("http://www.w3.org/2001/12/soap-envelope"). These attributes are: actor, mustUnderstand, and encodingStyle. The attributes defined in the SOAP Header defines how a recipient should process the SOAP message.
SOAP 在默认的命名空间中 ("http://www.w3.org/2001/12/soap-envelope") 定义了三个属性。这三个属性是：actor、 mustUnderstand 以及 encodingStyle。这些被定义在 SOAP 头部的属性可定义容器如何对 SOAP 消息进行处理。

The actor Attribute
actor 属性

A SOAP message may travel from a sender to a receiver by passing different endpoints along the message path. Not all parts of the SOAP message may be intended for the ultimate endpoint of the SOAP message but, instead, may be intended for one or more of the endpoints on the message path.
通过沿着消息路径经过不同的端点，SOAP 消息可从某个发送者传播到某个接收者。并非 SOAP 消息的所有部分均打算传送到 SOAP 消息的最终端点，不过，另一个方面，也许打算传送给消息路径上的一个或多个端点。

The SOAP actor attribute may be used to address the Header element to a particular endpoint.
SOAP 的 actor 属性可被用于将 Header 元素寻址到一个特定的端点。

Syntax
语法

soap:actor="URI"

Example
实例

<?xml version="1.0"?>
<soap:Envelope
xmlns:soap="http://www.w3.org/2001/12/soap-envelope"

soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding">

<soap:Header>
<m:Trans
xmlns:m="http://www.w3schools.com/transaction/"
soap:actor="http://www.w3schools.com/appml/">
234
</m:Trans>
</soap:Header>

...
...

</soap:Envelope>

The mustUnderstand Attribute
mustUnderstand 属性

The SOAP mustUnderstand attribute can be used to indicate whether a header entry is mandatory or optional for the recipient to process.
SOAP 的 mustUnderstand 属性可用于标识标题项对于要对其进行处理的接收者来说是强制的还是可选的。

If you add "mustUnderstand="1" to a child element of the Header element it indicates that the receiver processing the Header must recognize the element. If the receiver does not recognize the element it must fail when processing the Header.
假如您向 Header 元素的某个子元素添加了 "mustUnderstand="1"，则它可指示处理此头部的接收者必须认可此元素。假如此接收者无法认可此元素，则在处理此头部时必须失效。

Syntax
语法

soap:mustUnderstand="0|1"

Example
实例

<?xml version="1.0"?>
<soap:Envelope
xmlns:soap="http://www.w3.org/2001/12/soap-envelope"
soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding">

<soap:Header>
<m:Trans
xmlns:m="http://www.w3schools.com/transaction/"
soap:mustUnderstand="1">
234
</m:Trans>
</soap:Header>

...
...

</soap:Envelope>

The encodingStyle Attribute
encodingStyle属性

The SOAP encodingStyle attribute is explained in the previous chapter.
SOAP 的 encodingStyle 属性在上一节中已解释过了。

SOAP Envelope SOAP Body

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