SOAP and WSDL

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SOAP and WSDL

• CSCI 4300

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Simple SOAP message
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SOAP headers and body

• Headers
• Security credentials
• Transaction IDS
• Routing instructions
• Payment tokens
• Etc. etc.
• Body
• Actual message content

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Application-specific header example
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A security header
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Processing SOAP messages

• In particular, JAX-RPC implements remote
  procedure calls by exchanging SOAP messages

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Modular processing
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Message passing multiple actors
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Who processes the headers?

• A node which has identified itself with this
  processing role will process this header.

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SOAP use case
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Sequential processing

• Processing nodes can add and remove headers
• The Inventory node can add an authentication
  header and force the next node to process it

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Web Services Description Language
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portType a service access point
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Operation types
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WSDL SOAP binding

• The binding determines the format of the SOAP
  message that will transport a service

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Acknowledgements

• http//today.java.net/today/2003/11/05/ch4SOAP.pdf
  
• http//java.sun.com/developer/technicalArticles/xm
  l/webservices/
• http//www.w3schools.com/wsdl/wsdl_documents.asp