@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:_datum_	skos:broader	isac:display_function_ .
isac:_zoom_	skos:broader	isac:display_function_ .
isac:_lcd_	skos:broader	isac:display_function_ .