6.2 Literal Predicates

6.2 Literal Predicates🔗ℹ

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".

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

Returns #t if v1 and v2 are literal? values, and v1 is lexigraphically less than v2. This test is applied to all three components of the literal, where these are optional the value #f is ordered less than any string.

1	Introduction
2	Module name
3	Module resource
4	Module nsname
5	Module nsmap
6	Module literal
7	Module statement
8	Module triple
9	Module graph
10	Module tree
11	Module quad
12	Module dataset
13	Module query
14	Module io
15	Module schema
16	Vocabulary Modules
17	Appendix: Names Defined
	Bibliography
	Index

6.1	Literal Type
6.2	Literal Predicates
6.3	Conversion to Literal
6.4	Predefined Literals