add_triplets.RdCompose query parts for triplets with subject verb object.
add_triplets( query = NA, subject, verb, object, optional = FALSE, label = NA, limit = NA, within_box = c(NA, NA), within_distance = c(NA, NA) )
| subject | an anonymous variable (for instance, and by default, "?subject") or item (for instance "Q456")) |
|---|---|
| verb | the property (for instance "wdt:P190") |
| object | an anonymous variable (for instance, and by default, "?object") or item (for instance "Q456")) |
| optional | whether the triplet is optional (other results are sent back even if this particular triplet is missing) |
| label | a vector of variables for which to include a label column (defaults to NA) |
| limit | the max number of items sent back |
| within_box | if provided, rectangular bounding box for the triplet query. Provided as list(southwest=c(long=...,lat=...),northeast=c(long=...,lat=...)) |
| within_distance | if provided, circular bounding box for the triplet query. Provided as list(center=c(long=...,lat=...), radius=...), with radius in kilometers. The center can also be provided as a variable (for instance, "?location") for the center coordinates to be retrieved directly from the query. |
add_triplets(subject="?city", verb="wdt:P31/wdt:P279*", object="wd:Q515", label=c("?city"), limit=10) %>% add_triplets(subject="?city", verb="wdt:P1082",object="?pop", optional=TRUE) %>% add_triplets(subject="?city", verb="wdt:P625",object="?coords", within_box=list(southwest=c(3,43), northeast=c(7,47))) %>% build_sparql() %>% send_sparql()#> # A tibble: 10 x 4 #> city cityLabel pop coords #> <chr> <chr> <dbl> <chr> #> 1 http://www.wikidata.org/entity/… Avignon 91729 Point(4.808333333 43.94861… #> 2 http://www.wikidata.org/entity/… Nîmes 149633 Point(4.36 43.836944444) #> 3 http://www.wikidata.org/entity/… Nîmes 149633 Point(4.36 43.836944444) #> 4 http://www.wikidata.org/entity/… Nîmes 149633 Point(4.36 43.836944444) #> 5 http://www.wikidata.org/entity/… Nîmes 149633 Point(4.36 43.836944444) #> 6 http://www.wikidata.org/entity/… Nîmes 149633 Point(4.36 43.836944444) #> 7 http://www.wikidata.org/entity/… Nîmes 149633 Point(4.36 43.836944444) #> 8 http://www.wikidata.org/entity/… Nîmes 149633 Point(4.36 43.836944444) #> 9 http://www.wikidata.org/entity/… Nîmes 149633 Point(4.36 43.836944444) #> 10 http://www.wikidata.org/entity/… Nîmes 149633 Point(4.36 43.836944444)