perfsonar development work

[Jason Zurawski <>]

> But I think Ulisses asked also why <metadata> is inside <data> 
> element. Maybe you've already answered him, but I redirected him to 
> you, because you will explain him it better ;-) I suppose the reason 
> is in semantic difference between metadata (meta-description of data) 
> and data.

I didn't notice that was the actual question from the first e-mail, I 
thought he was asking about each element in the interface. 

The metadata element is inside of a data element because it is being 
submitted as data to the LS.  For example we know that an MA has a 
certain service description (described here as metadata):


   <nmwg:metadata id="serviceLookupInfo">
       <perfsonar:subject id="commonParameters" 
xmlns:perfsonar="http://ggf.org/ns/nmwg/tools/org/perfsonar/1.0/";>
           <psservice:service id="serviceParameters" 
xmlns:psservice="http://ggf.org/ns/nmwg/tools/org/perfsonar/service/1.0/";>
               <!-- some description of service for an MA, or MP, or 
whatever -->
           </psservice:service>
       </perfsonar:subject>
   </nmwg:metadata>
  


And the MA or MP allows access to certain metadata/data pairs:



   <nmwg:metadata id="meta1">
       <perfsonar:subject id="subj1" 
xmlns:perfsonar="http://ggf.org/ns/nmwg/tools/org/perfsonar/1.0/";>
           <!--  some description of an interface, or end point -->
       </perfsonar:subject>
       <nmwg:eventType>utilization</nmwg:eventType>
   </nmwg:metadata>

   <nmwg:data id="data1" metadataIdRef="meta1">
       <!-- datum elements -->
   </nmwg:data>


To properly submit this to the LS we send a service description and its 
'data' (which is really just the metadata of other measurements):


   <nmwg:metadata id="serviceLookupInfo">
       <perfsonar:subject id="commonParameters" 
xmlns:perfsonar="http://ggf.org/ns/nmwg/tools/org/perfsonar/1.0/";>
           <psservice:service id="serviceParameters" 
xmlns:psservice="http://ggf.org/ns/nmwg/tools/org/perfsonar/service/1.0/";>
               <!-- some description of service for an MA, or MP, or 
whatever -->
           </psservice:service>
       </perfsonar:subject>
   </nmwg:metadata>
   <nmwg:data id="data0" metadataIdRef="serviceLookupInfo">
       <nmwg:metadata id="meta1">
           <perfsonar:subject id="subj1" 
xmlns:perfsonar="http://ggf.org/ns/nmwg/tools/org/perfsonar/1.0/";>
               <!--  some description of an interface, or end point -->
           </perfsonar:subject>
           <nmwg:eventType>utilization</nmwg:eventType>
       </nmwg:metadata>
   </nmwg:data>


Does this make more sense Ulisses?

-jason