7.2 Component Predicates

predicate
(resource? val) → boolean?
val : any/c

A resource is identified by a URI, and so this test effectively ensures that val is an absolute URI.

predicate
(subject? val) → boolean?
val : any/c

A statement’s subject may be a resource? or a blank-node?.

predicate
(subject<? v1 v2) → boolean?
v1 : subject?
v2 : subject?

Returns #t if v1 and v2 are subject? values, and v1 is less than v2.

predicate
(predicate? val) → boolean?
val : any/c

A statement’s predicate must be a resource?.

predicate
(predicate<? v1 v2) → boolean?
v1 : predicate?
v2 : predicate?

Returns #t if v1 and v2 are predicate? values, and v1 is less than v2.

predicate
(object? val) → boolean?
val : any/c

A statement’s object may be either a resource?, blank-node?, or a literal?.

predicate
(object<? v1 v2) → boolean?
v1 : object?
v2 : object?

Returns #t if v1 and v2 are object? values, and v1 is less than v2.