How does XML relate to Web services and SOA?

Although many technologies can be used to implement a service-oriented architecture (SOA), the most common is to use Web services.

This means to use XML. SOAP and REST are the two most popular methods of implementing web services, both of which are based on XML.

An example
For example, by converting this SOAP documents are sent as web requests to Google web services. (As shown in Listing 2) ▼

▼List 2. Make a request to Google Web Services by sending a SOAP document

<?xml version=&#39;1.0&#39; encoding=&#39;UTF-8&#39;?><SOAP-ENV:Envelope 
xmlns:SOAP-ENV= "http://schemas.xmlsoap.org/soap/envelope/" 
xmlns:xsi="http://www.w3.org/1999/XMLSchema-instance" 
xmlns:xsd="http://www.w3.org/1999/XMLSchema"> <SOAP-ENV:Body> 
<ns1:doGoogleSearch xmlns:ns1="urn:GoogleSearch" SOAP-ENV:encodingStyle= 
"http://schemas.xmlsoap.org/soap/encoding/"> <key 
xsi:type="xsd:string">00000000000000000000000000000000</key> <q 
xsi:type="xsd:string">death star trash compactor</q> <start 
xsi:type="xsd:int">0</start> <maxResults 
xsi:type="xsd:int">10</maxResults> <filter 
xsi:type="xsd:boolean">true</filter> <restrict 
xsi:type="xsd:string"></restrict> <safeSearch 
xsi:type="xsd:boolean">false</safeSearch> <lr 
xsi:type="xsd:string"></lr> <ie 
xsi:type="xsd:string">latin1</ie> <oe 
xsi:type="xsd:string">latin1</oe> </ns1:doGoogleSearch> 
</SOAP-ENV:Body></SOAP-ENV:Envelope>

Here we can see SOAP envelope, which is a standard format understood by web service engines.

The content of this message (in this case doGoogleSearch element) is considered the payload, which consists of the information to be processed by the web service.

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