[Ws Wiki] Update of "Synapse/UserGuide" by SamindaAbeyruwan

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The following page has been changed by SamindaAbeyruwan:
http://wiki.apache.org/ws/Synapse/UserGuide

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  }}}
  Note that the rules, like the stages, can have more than one child. While it isn’t fixed in Synapse, the built-in rules and mediators all use the same “plan” to execute their children, which involves executing in the lexical order that they occur in the synapse.xml.
  
+ == Ruel Configuration Elements ==
+ 
+ Synapse rule configurations are done with xml Elements. Every Element maps to a instance of a Processor. Thus, there are Elements that can be used in hierarchical order, which exhibits a  higher precedence over some Elements (ex: <regex/> over <xpath/>) and others will act stand alone (ex: <engage-addressing-in/>). 
+ 
+ {{{
+ Elements that can be used in hierarchical order as follows with there default precedence.
+ 
+ 1.<regex/>
+ 2.<xpaht/>
+ 
+ Elements that can be used in stand alone
+ 
+ 1.<engage-addressing-in/>
+ 2.<servicemediator/>
+ 3.<classmediator/>
+ 
+ Built in Elements
+ 
+ 1.<log/>
+ 2.<fault/>
+ 3.<send/>
+ 4.<header/>
+ 
+ Stage Elements
+ 
+ 1.<stage/>
+ 2.<in/>
+ 3.<out/>
+ 4.<never/>
+ 
+ Reference Elements
+ 
+ 1. <ref/>
+ }}}
+ 
+ 
  == Samples ==
  
  === Logging ===