5.2 Literal Predicates

predicate
(has-datatype-iri? val) → boolean?
val : literal?

Returns true if this literal has a datatype URI.

predicate
(has-language-tag? val) → boolean?
val : literal?

Returns true if this literal has a language tag.

predicate
(has-xsd-datatype? val) → boolean?
val : literal?

Returns true if this literal has a datatype URI and that URI is in the XML Schema namespace.

predicate
(is-a? val datatype) → boolean?
val : literal?
datatype : url-absolute?

Returns true if this literal has a datatype URI and that URI is equal? to "datatype".