event subscribe operation SET-PROPERTY ?

I notified in model draft when one wants to subcribe to an event,he uses 
SET-PROPERTY operation and use the path composed of event base id plus 
event id,here is a problem because we haven't defined operation 
SET-PROPERTY in protocol draft,and even a broader question,how should we do 
to get and set LFB element properities,how should the path be used,if I 
misunderstand something here,I am sorry.
And another question,because i am not an xml expert,i don't know why we not 
define <eventTarget> element as follows:
<eventTargets>
   <eventTarget>
      <eventField>..</eventField>
      <eventSubscript>..</eventSubcript>
   </eventTarget>
   <eventTarget>
      <eventField>..</eventField>
      <eventSubscript>..</eventSubcript>
   </eventTarget>
    ...
</eventTarget>
and the same question to <events> Element Conditions declaration.
Yours,Fenggen

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