The following predicates are utilities to access RDF 1.1 collections.
A collection is a linked list created from rdf:first and rdf:next
triples, ending in rdf:nil.
- [det]rdf_last(+RDFList,
-Last)
- True when Last is the last element of RDFList.
Note that if the last cell has multiple rdf:first triples, this
predicate becomes nondet.
- [semidet]rdf_list(?RDFTerm)
- True if RDFTerm is a proper RDF list. This implies that every
node in the list has an
rdf:first and rdf:rest
property and the list ends in rdf:nil.
If RDFTerm is unbound, RDFTerm is bound to each maximal
RDF list. An RDF list is maximal if there is no triple rdf(_, rdf:rest, RDFList).
- [det]rdf_list(+RDFList,
-PrologList)
- True when PrologList represents the rdf:first objects for all
cells in RDFList. Note that this can be non-deterministic if
cells have multiple rdf:first or rdf:rest triples.
- [nondet]rdf_length(+RDFList,
-Length:nonneg)
- True when Length is the number of cells in RDFList.
Note that a list cell may have multiple rdf:rest triples, which makes
this predicate non-deterministic. This predicate does not check whether
the list cells have associated values (rdf:first). The list must end in
rdf:nil.
- [nondet]rdf_member(?Member,
+RDFList)
- True when Member is a member of RDFList
- [nondet]rdf_nth0(?Index,
+RDFList, ?X)
- [nondet]rdf_nth1(?Index,
+RDFList, ?X)
- True when X is the Index-th element (0-based or
1-based) of
RDFList. This predicate is deterministic if Index
is given and the list has no multiple rdf:first or rdf:rest values.
- [det]rdf_assert_list(+PrologList,
?RDFList)
- [det]rdf_assert_list(+PrologList,
?RDFList, +Graph)
- Create an RDF list from the given Prolog List. PrologList
must be a proper Prolog list and all members of the list must be
acceptable as object for rdf_assert/3.
If RDFList is unbound and
PrologList is not empty, rdf_create_bnode/1
is used to create
RDFList.
- [det]rdf_retract_list(+RDFList)
- Retract the rdf:first, rdf:rest and rdf:type=rdf:'List’triples
from all nodes reachable through rdf:rest. Note that other triples that
exist on the nodes are left untouched.