Other SDE Aspects
    
      - Dynamic ServiceData
	
	  - SDEs can be dynamically "added" to the set of SDEs
- This is done by the service implementation extending the SDE
	    named "ServiceDataName"
	    
	      - Defined in GridService portType
 
 
- Time-related attributes
	
	  - goodFrom
- goodUntil
- availableUntil