measurement_data_object_descriptor
		identifiers
				identifier		[required;  applies to entire object;  only one primary entry allowed]
						rank=primary|secondary=primary
						type=urn|variable|key|token=urn
						source=holderid_n=holderid_1
						value=text
						         =urn
								 =domain:subdomain+object_type+object_name		[object_name should be unique within domain:subdomain for this object_type]
							     =geni.net:holder_1.org+object_type+object_name		

				identifier  				[optional]
						rank=primary|secondary=secondary
				
				title=text					[optional]
				abstract=text			[optional]
				subject=text			[optional]
				keywords=text		[optional]
				annotation		[optional]
						user_id=text
						date_time=text
						entry=text
										
				annotation 		[optional]
						
		descriptors
				descriptor		[required;  applies to entire object;  only one entry allowed]
						level=1						object_type=meas_data_collection|meas_data_flow|meas_data_directory|meas_data_file|meas_data_database|meas_data_service_portal|meas_data_service_GUI  	  [required;  where is the list defined?]
						collection_geographic_location=text		[optional]
						collection_start_date_time=numerical		[optional]
						collection_end_date_time=numerical		[optional]
						project_id=text		[optional]
						slice_id=text		[optional]
						experiment_id=text		[optional]
						run_id=text		[optional]
						target=text		[e.g., what hosts, where in the topology;  equivalent to perfSONAR Subject;  optional;  use topology info?]
						category=(text from list:  ?)  [e.g., what type of tests;  equivalent to perfSONAR EventType;  optional;  where is the list defined?]
								parameters
										parameter_1= text	[optional;  as required by category;  equivalent to perfSONAR Parameters]
			
										parameter_n= text	[optional;  as required by category;  equivalent to perfSONAR Parameters]
		
						object_size=numerical  			[optional]
						flow_rate=numerical  				[optional]
						locator		[required]
								view=global|per_association|by_holder
								holder=holderid_n		[optional]
								type=path|url|etc
								value=text 		[required;  equivalent to perfSONAR portal url]
								access_method= text	[optional;  when required]
								
						locator		[optional]
		
						object_format=perfSONAR_API|OML_DB|GUI|etc  		[required; depends on type; where is the list defined?;  for perfSONAR, would specify perfSONAR API]
						interpretation_method 				[required; depends on type and format]
								
								
						
						encryption=yes|no
						encryption_method						[optional; depends on type and format]
						
						
						annotation		[optional]
								user_id=text
								date_time=text
								entry=text
										
						annotation 		[optional]


					descriptors_nextleveldown		[optional]
						descriptor	
								level=2
			
						descriptor		[optional]
								level=2
			
		holders
					holder
							id=holderid_1		[required;  gathered measurement data;  in perfSONAR, this is the MeasArchive Srvc]
							order=1
							domain=geni.net
							subdomain=holder_1.org
							project_id=text		[optional]
							slice_id=text		[optional]
							service_id=text		[optional]
							user_id=text		[optional]
							contact		[required;  applies to entire object;  only one primary entry allowed]
									type=email|url		[optional;  equivalent to perfSONAR portal url when used for authorization]
									value=text
							collection=yes|inherited
							collection_policy			[optional;  relevant policy when measurement data was collected by this holder]
							
							anonymization=yes|yes_inherited|not_required
							anonymization_method	[optional; used when measurement data was collected by this holder]
							
							sharing=allowed|allowed_inherited|not_allowed
							sharing_policy		[optional;  relevant policy when measurement data is to be shared by this holder]
							
							disposal=specified|specified_inherited|not_specified
							disposal_policy		[optional;  relevant policy when measurement data is to be shared by this holder]			
	
							transaction
									transaction_id=text		[unique]
									transaction_type=collected|received|returned|registered|modified|shared|assigned|etc.    [where is the list defined?]
									transaction_date_time=text
									transaction_info		{depends on transaction_type]
									
									
									annotation		[optional]
											user_id=text
											date_time=text
											entry=text
										
									annotation
									
							transaction

					holder