table	when column	when condition	then column	then condition	level	description
table2	foo	null	bar	null	error	bar must be null whenever foo is null
table2	foo	not null	bar	not null	error	bar cannot be null if foo is not null
table2	foo	IRI	bar	label	error	bar must be a label if foo is an IRI
table2	foo	equals(5)	bar	in('y', 'z')	error	bar must be 'y' or 'z' if foo = 5
table6	foo	null	bar	null	error	bar must be null whenever foo is null
table6	foo	not null	bar	not null	error	bar cannot be null if foo is not null
table6	foo	IRI	bar	label	error	bar must be a label if foo is an IRI
table6	foo	equals(e)	bar	in(25, 26)	error	bar must be 25 or 26 if foo = 'e'