@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:_n_	skos:broader	isac:nonnegative_integer_ .
isac:_number_	skos:broader	isac:nonnegative_integer_ .
isac:_zero_	skos:broader	isac:nonnegative_integer_ .
isac:_value_	skos:broader	isac:nonnegative_integer_ .