| annotation | 
					| documentation |  Recommended best practice is to reference the resource by means of a 
				string or number conforming to a formal identification system. Relation is used to 
				show the relation in content to another resource. For example, "IsPartOf" is used to 
				show the relation between a part of a radio programme and the whole programme, or 
				between a track and a record album. A resource can be identified by its title, or 
				preferably by an identifier. Relation is used to provide a name, locator, accession, 
				identification number or ID where the related item can be obtained or found. 
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