@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:_article_	skos:broader	isac:project-based_learning_ .
isac:_school_	skos:broader	isac:project-based_learning_ .
isac:_student_	skos:broader	isac:project-based_learning_ .