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TABLE 12.1
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Role Node Initial sender Intermediary
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Not applicable Not applicable Not applicable Not applicable
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Ultimate receiver Yes
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the value ultimateReceiver of the attribute can be set explicitly or set implicitly by not having the attribute. Note that the Body element does not have a role attribute. Therefore, the body is always targeted to be processed by the ultimate receiver node. Table 12.1 summarizes the applicable standardized roles that may be assumed at various SOAP nodes. ( Yes and No mean that the corresponding node does or does not, respectively, play the named role.)
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Listing 12-3
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Listing 12.3 1 < xml version="1.0" > 2 <env:Envelope xmlns:env="http://www.w3.org/2003/05/soap-envelope"> 3 <env:Header> 4 <m:Block1 xmlns:m=http://myCompany.com 5 env:role="http://myCompany.com/Log"> 6 ... 7 ... 8 </m:Block1> 9 <n:Block2 xmlns:n="http://myCompany.com" 10 env:role="http://www.w3.org/2003/05/soap11 envelope/role/next"> 12 ... 13 ... 14 </n:Block2> 15 <o:Block3 xmlns:o="http://myCompany.com"> 16 ... 17 ... 18 </o:Block3> 19 </env:Header> 20 <env:Body > 21 ... 22 ... 23 </env:Body> 24 </env:Envelope>
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The mustUnderstand Attribute
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The mustUnderstand attribute is complementary to the role attribute. The purpose of this attribute is to ensure that SOAP nodes do not ignore
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header blocks that are important to the overall purpose of the application. When this attribute is set to a value of true , the targeted SOAP node must process the block according to the specification of that block. Such a block is colloquially referred to as a mandatory header block. In fact, the processing of the SOAP message must not even start until the node has identified all the mandatory header blocks targeted at itself and has understood them. Understanding a header means that the node must be prepared to do whatever is described in the specification of that block. A mustUnderstand value of true means that the SOAP node must process the header with the semantics described in that header s specification, or else generate a SOAP fault. Processing the header appropriately may include removing the header from any generated SOAP message, reinserting the header with the same or an altered value, or inserting a new header. The inability to process a mandatory header requires that all further processing of the SOAP message cease and that a SOAP fault be generated. The message is not forwarded any further. Table 12.2 summarizes how the processing actions for a header block are qualified by the mustUnderstand attribute with respect to a node that has been appropriately targeted through the role attribute.
The relay Attribute
SOAP defines another attribute, called relay. It is of type Boolean and can assume a value of true or false . This attribute indicates whether the header block targeted at a SOAP node must be relayed if it is not processed. If the message is processed by the targeted SOAP node, the header block must be removed from the outbound message. The default behavior for an unprocessed header block targeted at a role played by a SOAP intermediary is that it must be removed before the message is relayed. If the attribute rely is set to true for the header block targeted at the node with the role next , it ensures that each intermediary has a chance to examine the header, because one of the anticipated uses of the next role is with header blocks that carry information expected to persist along a SOAP message path. Note that setting the relay attribute
TABLE 12.2
Processing Actions for Various Values of the mustUnderstand Attribute True Must process Must process False May process May process Absent May process May process
mustUnderstand Node Intermediary Ultimate receiver
Twelve
is meaningless for header blocks that are targeted at ultimateReceiver and none. Listing 12-4 shows the use of the relay attribute in one of the header blocks.
Listing 12-4
Listing 12.4: An example of the use of attribute relay 1 < xml version="1.0" > 2 <env:Envelope xmlns:env="http://www.w3.org/2003/05/soap-envelope"> 3 <env:Header> 4 <m:Blockm xmlns:p=http://myCompany.com 5 env:role=http://myCompany.com/Log 6 env:mustUnderstand="true"> 7 ... 8 ... 9 </m:Blockm> 10 <n:Blockn xmlns:q="http://myComapny.com" 11 env:role="http://www.w3.org/2003/05/soap-envelope/role/next" 12 env:relay="true"> 13 ... 14 ... 15 </n:Blockn> 16 <r:Blockr xmlns:r="http://myCompany.com"> 17 ... 18 ... 19 </r:Blockr> 20 </env:Header> 21 <env:Body > 22 ... 23 ... 24 </env:Body> 25 </env:Envelope>
SOAP Message Exchange Types A SOAP message is fundamentally a one-way transmission between SOAP nodes, from a SOAP sender to a SOAP receiver. However, SOAP messages can be combined to obtain more complex interaction patterns, such as RPC-type request/response and back-and-forth conversational messages. We discuss the RPC-type request/response interaction next.
Remote Procedure Call (RPC)
One of goals of the SOAP specification is to define a uniform representation for RPC invocations and responses carried in SOAP messages. This is done using the flexibility and extensibility of XML.
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