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some confused question
I am confused about several questions

1. what relationship between SOAP, XML-RPC and RPC?
2. Now web service could use either SOAP or XML-RPC. is it right?
3. how many solutions to solve the web sevice security?

in very simple language :
1-SOAP : is an standard which define , how should messages that come from entity to another entity looks like. it define the structure of xml file that contain web service request and response.
so when you execute a web service you send the service container a message in soap format and the result of execution will come back in SOAP format.

XML-RPC and RPC are two method of calling a remote method :-) , it means that you can use XML-RPC or RPC to call a method in a remote computer.
XML-RPC will use XML as Transfering mechanism.

2-web service can use SOAP+XML-RPC together . they use XML-RPC as a calling mechanism and SOAP as a transportation format for messages.

3- it is very wide topic , take a look at :

Be aware that "XML-RPC" has two different meanings. One is the act of performing RPC by exchanging XML messages (and the XML could be SOAP). The other is the XML-RPC protocol, which I think was a brainchild of Dave Winer. It's a simpler and less powerful alternative to SOAP, but no longer widely used, now that SOAP is supported everywhere.

The standard for WS security is called, well, "WS-Security", and implemented in Java by the WSS4J library. There was a recent article in the JavaRanch Journal that may give you some starting points.
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