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		| Paper: | 
		Metadata Evolution in the Planetary Data System | 
	 
	
		| Volume: | 
		527, Astronomical Data Analysis Software and Systems XXIX | 
	 
	
		| Page: | 
		343 | 
	 
	
		| Authors: | 
		Raugh, A. C.; Hughes, J. S.; Padams, J. H. | 
	 
	
	
		| Abstract: | 
		Nearly three decades after the Planetary Data System (PDS) metadata standards were
 first developed solely to describe mission data, the PDS archive holdings now comprise
 a very heterogeneous collection that also includes ground-based, airborne, and derived
 high-level products in addition to primary mission results. While the PDS3 standards
 were developed at a time when users primarily wanted to lay hands on data they already
 knew existed, PDS is now in an era where an increasing number of users want to discover
 whether data exist based on the intrinsic properties of the data (target, wavelength
 range, etc.) rather than prior knowledge about what instrument or observing program
 produced the result. We describe how the metadata in the new PDS4 standard has been
 designed specifically to address this change in user expectations for discoverability. | 
	 
	
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