SPARQL 1.1 defines path operators for combining/repeating predicates in triple-patterns.
We overload some Python operators on URIRefs to allow creating path operators directly in Python.
| Operator | Path |
|---|---|
p1 / p2 |
Path sequence |
p1 | p2 |
Path alternative |
p1 * '*' |
Chain of 0 or more p’s |
p1 * '+' |
Chain of 1 or more p’s |
p1 * '?' |
0 or 1 p |
~p1 |
p1 inverted, i.e. (s p1 o) ⇔ (o ~p1 s) |
-p1 |
NOT p1, i.e. any property but p1 |
These can then be used in property position for s,p,o triple queries
for any graph method.
See the docs for paths for the details.
This example shows how to get the name of friends (i.e values two steps away x knows y, y name z) with a single query.
Attributes:
-
EXAMPLES_DIR– -
g– -
tim–