This article describes how to access the Marine Regions Gazetteer
entries and geometries as RDF, which are loaded into R via
rdflib::rdf. Mirroring the Marine Regions Gazetteer via Linked Data Event Streams
is discussed.
The following libraries are required
library(mregions2)
library(rdflib)
#> Warning: package 'rdflib' was built under R version 4.4.2
# Use the pipe operator `%>%`
library(magrittr)
# For visualizing
library(mapview)
#> Warning: package 'mapview' was built under R version 4.4.2
library(jsonlite)Retrieving the Marine Regions Gazetteer as RDF
Known an ?MRGID, you can get the gazetter entry as
RDF.
E.g. the Belgian Exclusive Economic Zone or Belgian Part of the North
Sea has the ?MRGID:
<https://marineregions.org/mrgid/3293>
gaz_search(3293) %>%
gaz_geometry() %>%
mapview()Using gaz_search() or the underlying service
gaz_rest_record_by_mrgid() with the argument
rdf = TRUE will:
- Use content negotiation to get the gazetteer record in Turtle format.
- Read this document as RDF using the
rdflibR package (?rdflib::rdflib)
HTTP requests are handled with httr2
(?httr2::httr2)
bpns <- gaz_search(3293, rdf = TRUE)
class(bpns)
#> [1] "rdf"
bpns
#> Total of 99 triples, stored in hashes
#> -------------------------------
#> @base <localhost://> .
#> @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
#>
#> <http://marineregions.org/mrgid/14>
#> a <http://marineregions.org/ns/ontology#MRGeoObject>, <http://marineregions.org/ns/placetypes#Nation> ;
#> <http://www.w3.org/2004/02/skos/core#prefLabel> "Belgium"@en .
#>
#> <http://marineregions.org/mrgid/17401>
#> a <http://marineregions.org/ns/ontology#MRGeoObject>, <http://marineregions.org/ns/placetypes#Wreck> ;
#> <http://www.w3.org/2004/02/skos/core#prefLabel> "Birkenfels"@en .
#>
#> ... with 89 more triplesThere are many stores returned. This is because the returned object includes not only info about the Gazetteer record, but also about its hierarchy. The Marine Regions Gazetteer is hierarchical and there are many relations between their records
The relations are explained the Marine Regions Ontology:
http://marineregions.org/ns/ontology
There is also information about the Place Type. The Place Types are defined in:
http://marineregions.org/ns/placetypes
Both the ontology and the placetypes are available as HTML when using a web browser, but also as Turtle or JSON-LD by using content negotiation.
You can then use rdflib::rdflib to apply common RDF
applications.
Serialize
You can serialize the record in other formats, e.g. JSON-LD
# Create a placeholder file
bpns_as_jsonld <- tempfile(fileext = ".rdf")
# Serialize
bpns %>% rdf_serialize(
doc = bpns_as_jsonld,
format = "jsonld"
)
readLines(bpns_as_jsonld) %>% jsonlite::prettify()Show Output
#> {
#> "@graph": [
#> {
#> "@id": "http://marineregions.org/mrgid/14",
#> "@type": [
#> "http://marineregions.org/ns/placetypes#Nation",
#> "http://marineregions.org/ns/ontology#MRGeoObject"
#> ],
#> "http://www.w3.org/2004/02/skos/core#prefLabel": {
#> "@language": "en",
#> "@value": "Belgium"
#> }
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/17401",
#> "@type": [
#> "http://marineregions.org/ns/placetypes#Wreck",
#> "http://marineregions.org/ns/ontology#MRGeoObject"
#> ],
#> "http://www.w3.org/2004/02/skos/core#prefLabel": {
#> "@language": "en",
#> "@value": "Birkenfels"
#> }
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/17409",
#> "@type": [
#> "http://marineregions.org/ns/placetypes#Wreck",
#> "http://marineregions.org/ns/ontology#MRGeoObject"
#> ],
#> "http://www.w3.org/2004/02/skos/core#prefLabel": {
#> "@language": "en",
#> "@value": "Bourrasque"
#> }
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/17666",
#> "@type": [
#> "http://marineregions.org/ns/placetypes#Wreck",
#> "http://marineregions.org/ns/ontology#MRGeoObject"
#> ],
#> "http://www.w3.org/2004/02/skos/core#prefLabel": {
#> "@language": "en",
#> "@value": "Kilmore Shipwreck"
#> }
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/17865",
#> "@type": [
#> "http://marineregions.org/ns/placetypes#Wreck",
#> "http://marineregions.org/ns/ontology#MRGeoObject"
#> ],
#> "http://www.w3.org/2004/02/skos/core#prefLabel": {
#> "@language": "de",
#> "@value": "Sperrbrecher"
#> }
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/19673",
#> "@type": [
#> "http://marineregions.org/ns/placetypes#InhabitedPlace",
#> "http://marineregions.org/ns/ontology#MRGeoObject"
#> ],
#> "http://www.w3.org/2004/02/skos/core#prefLabel": {
#> "@language": "nl",
#> "@value": "Nieuwpoort-Bad"
#> }
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/2350",
#> "@type": [
#> "http://marineregions.org/ns/placetypes#IHOSeaArea",
#> "http://marineregions.org/ns/ontology#MRGeoObject"
#> ],
#> "http://www.w3.org/2004/02/skos/core#prefLabel": {
#> "@language": "en",
#> "@value": "North Sea"
#> }
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/2419",
#> "@type": [
#> "http://marineregions.org/ns/placetypes#SandbankSystem",
#> "http://marineregions.org/ns/ontology#MRGeoObject"
#> ],
#> "http://www.w3.org/2004/02/skos/core#prefLabel": {
#> "@language": "en",
#> "@value": "Hinder Banks"
#> }
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/2420",
#> "@type": [
#> "http://marineregions.org/ns/placetypes#SandbankSystem",
#> "http://marineregions.org/ns/ontology#MRGeoObject"
#> ],
#> "http://www.w3.org/2004/02/skos/core#prefLabel": {
#> "@language": "en",
#> "@value": "Zeeland Banks"
#> }
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/2421",
#> "@type": [
#> "http://marineregions.org/ns/placetypes#SandbankSystem",
#> "http://marineregions.org/ns/ontology#MRGeoObject"
#> ],
#> "http://www.w3.org/2004/02/skos/core#prefLabel": {
#> "@language": "en",
#> "@value": "Flemish Banks"
#> }
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/24676",
#> "@type": [
#> "http://marineregions.org/ns/placetypes#Sandbank",
#> "http://marineregions.org/ns/ontology#MRGeoObject"
#> ],
#> "http://www.w3.org/2004/02/skos/core#prefLabel": {
#> "@language": "nl",
#> "@value": "Lodewijkbank"
#> }
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/2550",
#> "@type": [
#> "http://marineregions.org/ns/placetypes#Coast",
#> "http://marineregions.org/ns/ontology#MRGeoObject"
#> ],
#> "http://www.w3.org/2004/02/skos/core#prefLabel": {
#> "@language": "en",
#> "@value": "Belgian Coast"
#> }
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/26567",
#> "@type": [
#> "http://marineregions.org/ns/placetypes#MarineRegion",
#> "http://marineregions.org/ns/ontology#MRGeoObject"
#> ],
#> "http://www.w3.org/2004/02/skos/core#prefLabel": {
#> "@language": "en",
#> "@value": "Belgian part of the North Sea"
#> }
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/27234",
#> "@type": [
#> "http://marineregions.org/ns/placetypes#Natura2000SpecialProtectionAreaAndSiteOfCommunityImportanceSPAAndSCIEUBirdsAndHabitatsDirective",
#> "http://marineregions.org/ns/ontology#MRGeoObject"
#> ],
#> "http://www.w3.org/2004/02/skos/core#prefLabel": {
#> "@language": "nl",
#> "@value": "Westerschelde & Saeftinghe"
#> }
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/27555",
#> "@type": [
#> "http://marineregions.org/ns/placetypes#Natura2000SiteOfCommunityImportanceSCIEUHabitatsDirective",
#> "http://marineregions.org/ns/ontology#MRGeoObject"
#> ],
#> "http://www.w3.org/2004/02/skos/core#prefLabel": {
#> "@language": "nl",
#> "@value": "Vlakte Van de Raan"
#> }
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/27637",
#> "@type": [
#> "http://marineregions.org/ns/placetypes#Natura2000SiteOfCommunityImportanceSCIEUHabitatsDirective",
#> "http://marineregions.org/ns/ontology#MRGeoObject"
#> ],
#> "http://www.w3.org/2004/02/skos/core#prefLabel": {
#> "@language": "fr",
#> "@value": "Dunes de La Plaine Maritime Flamande"
#> }
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/27790",
#> "@type": [
#> "http://marineregions.org/ns/placetypes#Natura2000SpecialProtectionAreaSPAEUBirdsDirective",
#> "http://marineregions.org/ns/ontology#MRGeoObject"
#> ],
#> "http://www.w3.org/2004/02/skos/core#prefLabel": {
#> "@language": "nl",
#> "@value": "Sbz 2 / Zps 2"
#> }
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/28140",
#> "@type": [
#> "http://marineregions.org/ns/placetypes#Natura2000SpecialProtectionAreaSPAEUBirdsDirective",
#> "http://marineregions.org/ns/ontology#MRGeoObject"
#> ],
#> "http://www.w3.org/2004/02/skos/core#prefLabel": {
#> "@language": "nl",
#> "@value": "Zwin"
#> }
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/28142",
#> "@type": [
#> "http://marineregions.org/ns/placetypes#Natura2000SiteOfCommunityImportanceSCIEUHabitatsDirective",
#> "http://marineregions.org/ns/ontology#MRGeoObject"
#> ],
#> "http://www.w3.org/2004/02/skos/core#prefLabel": {
#> "@language": "nl",
#> "@value": "Zwin"
#> }
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/28226",
#> "@type": [
#> "http://marineregions.org/ns/placetypes#Natura2000SiteOfCommunityImportanceSCIEUHabitatsDirective",
#> "http://marineregions.org/ns/ontology#MRGeoObject"
#> ],
#> "http://www.w3.org/2004/02/skos/core#prefLabel": {
#> "@language": "nl",
#> "@value": "Schelde- En Durmeëstuarium Van de Nederlandse Grens Tot Gent"
#> }
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/28318",
#> "@type": [
#> "http://marineregions.org/ns/placetypes#Natura2000SpecialProtectionAreaSPAEUBirdsDirective",
#> "http://marineregions.org/ns/ontology#MRGeoObject"
#> ],
#> "http://www.w3.org/2004/02/skos/core#prefLabel": {
#> "@language": "nl",
#> "@value": "Sbz 1 / Zps 1"
#> }
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/3293",
#> "@type": [
#> "http://marineregions.org/ns/placetypes#EEZ",
#> "http://marineregions.org/ns/ontology#MRGeoObject"
#> ],
#> "http://marineregions.org/ns/ontology#contains": [
#> {
#> "@id": "http://marineregions.org/mrgid/28318"
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/27790"
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/27555"
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/17865"
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/17666"
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/17409"
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/17401"
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/4675"
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/2421"
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/2420"
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/2419"
#> }
#> ],
#> "http://marineregions.org/ns/ontology#hasGeometry": {
#> "@id": "http://marineregions.org/mrgid/3293/geometries?source=79&attributeValue=3293"
#> },
#> "http://marineregions.org/ns/ontology#isAdjacentTo": [
#> {
#> "@id": "http://marineregions.org/mrgid/19673"
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/2550"
#> }
#> ],
#> "http://marineregions.org/ns/ontology#isPartOf": [
#> {
#> "@id": "http://marineregions.org/mrgid/2350"
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/14"
#> }
#> ],
#> "http://marineregions.org/ns/ontology#isPreferredAlternativeOf": {
#> "@id": "http://marineregions.org/mrgid/26567"
#> },
#> "http://marineregions.org/ns/ontology#partlyContains": [
#> {
#> "@id": "http://marineregions.org/mrgid/28226"
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/28142"
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/28140"
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/27637"
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/27234"
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/24676"
#> }
#> ],
#> "http://purl.org/dc/terms/modified": {
#> "@type": "http://www.w3.org/2001/XMLSchema#dateTime",
#> "@value": "2023-10-28T08:26:23Z"
#> },
#> "http://www.w3.org/2004/02/skos/core#altLabel": {
#> "@language": "en",
#> "@value": "Belgian Continental Shelf"
#> },
#> "http://www.w3.org/2004/02/skos/core#prefLabel": {
#> "@language": "en",
#> "@value": "Belgian Exclusive Economic Zone"
#> },
#> "http://www.w3.org/ns/dcat#bbox": {
#> "@type": "http://www.opengis.net/ont/geosparql#wktLiteral",
#> "@value": "<http://www.opengis.net/def/crs/OGC/1.3/CRS84> POLYGON ((4.40204 51.87611,2.23833 51.87611,2.23833 51.03976,4.40204 51.03976,4.40204 51.87611))"
#> },
#> "http://www.w3.org/ns/dcat#centroid": {
#> "@type": "http://www.opengis.net/ont/geosparql#wktLiteral",
#> "@value": "<http://www.opengis.net/def/crs/OGC/1.3/CRS84> POINT (2.72132 51.46321)"
#> },
#> "http://www.w3.org/ns/hydra/core#next": {
#> "@id": "http://marineregions.org/mrgid/3293?page=2"
#> },
#> "http://www.w3.org/ns/prov#hadPrimarySource": {
#> "@id": "http://www.marineregions.org"
#> }
#> },
#> {
#> "@id": "http://marineregions.org/mrgid/4675",
#> "@type": [
#> "http://marineregions.org/ns/placetypes#SandbankSystem",
#> "http://marineregions.org/ns/ontology#MRGeoObject"
#> ],
#> "http://www.w3.org/2004/02/skos/core#prefLabel": {
#> "@language": "en",
#> "@value": "Coastal Banks"
#> }
#> },
#> {
#> "@id": "http://www.marineregions.org",
#> "http://www.w3.org/2000/01/rdf-schema#label": "Flanders Marine Institute (2023). Maritime Boundaries Geodatabase: Maritime Boundaries and Exclusive Economic Zones (200NM), version 12. Available online at http://www.marineregions.org/. https://doi.org/10.14284/632"
#> }
#> ]
#> }SPARQL Queries
SPARQL queries
can be applied to the RDF document. Note: The ?MRGID of the
Belgian Part of the North Sea is
<http://marineregions.org/mrgid/3293>
Extract all info from the record
sparql <- "
SELECT ?p ?o
WHERE {
<http://marineregions.org/mrgid/3293> ?p ?o
}"
rdf_query(bpns, query = sparql)
#> # A tibble: 32 × 2
#> p o
#> <chr> <chr>
#> 1 http://marineregions.org/ns/ontology#contains http://marineregions.org/mrgid…
#> 2 http://marineregions.org/ns/ontology#contains http://marineregions.org/mrgid…
#> 3 http://marineregions.org/ns/ontology#contains http://marineregions.org/mrgid…
#> 4 http://marineregions.org/ns/ontology#contains http://marineregions.org/mrgid…
#> 5 http://marineregions.org/ns/ontology#contains http://marineregions.org/mrgid…
#> 6 http://marineregions.org/ns/ontology#contains http://marineregions.org/mrgid…
#> 7 http://marineregions.org/ns/ontology#contains http://marineregions.org/mrgid…
#> 8 http://marineregions.org/ns/ontology#contains http://marineregions.org/mrgid…
#> 9 http://marineregions.org/ns/ontology#contains http://marineregions.org/mrgid…
#> 10 http://marineregions.org/ns/ontology#contains http://marineregions.org/mrgid…
#> # ℹ 22 more rowsExtract all relationship
The following example extracts all the predicates with the prefix
mr:, pointing to the Marine Regions Ontology at http://marineregions.org/ns/ontology.
sparql <- "
PREFIX mr: <http://marineregions.org/ns/ontology#>
SELECT ?s ?p ?o
WHERE {
?s ?p ?o .
FILTER( STRSTARTS(STR(?p), str(mr:)) )
}"
rdf_query(bpns, query = sparql)
#> # A tibble: 23 × 3
#> s p o
#> <chr> <chr> <chr>
#> 1 http://marineregions.org/mrgid/3293 http://marineregions.org/ns/ontolo… http…
#> 2 http://marineregions.org/mrgid/3293 http://marineregions.org/ns/ontolo… http…
#> 3 http://marineregions.org/mrgid/3293 http://marineregions.org/ns/ontolo… http…
#> 4 http://marineregions.org/mrgid/3293 http://marineregions.org/ns/ontolo… http…
#> 5 http://marineregions.org/mrgid/3293 http://marineregions.org/ns/ontolo… http…
#> 6 http://marineregions.org/mrgid/3293 http://marineregions.org/ns/ontolo… http…
#> 7 http://marineregions.org/mrgid/3293 http://marineregions.org/ns/ontolo… http…
#> 8 http://marineregions.org/mrgid/3293 http://marineregions.org/ns/ontolo… http…
#> 9 http://marineregions.org/mrgid/3293 http://marineregions.org/ns/ontolo… http…
#> 10 http://marineregions.org/mrgid/3293 http://marineregions.org/ns/ontolo… http…
#> # ℹ 13 more rowsExtract geometries
You can see in the predicates that one of the relationships is
mr:hasGeometry, pointing to the object http://marineregions.org/mrgid/3293/geometries?source=79&attributeValue=3293
This URI can be requested as Turtle with content negotiation and load
as an rdflib::rdf object of the rdflib::rdflib
package
But you could also use gaz_geometry(), which already
takes care of this:
bpns_geom <- gaz_geometry(3293, format = "rdf")
bpns_geom
#> Total of 4 triples, stored in hashes
#> -------------------------------
#> @base <localhost://> .
#> @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
#>
#> <http://marineregions.org/mrgid/3293>
#> <http://marineregions.org/ns/ontology#hasGeometry> <http://marineregions.org/mrgid/3293/geometries?source=79&attributeValue=3293> .
#>
#> <http://marineregions.org/mrgid/3293/geometries?source=79&attributeValue=3293>
#> <http://www.opengis.net/ont/geosparql#asWKT> "<http://www.opengis.net/def/crs/OGC/1.3/CRS84> MULTIPOLYGON (((4.24204865 51.35396728, 4.23073486 51.35824973, 4.22674608 51.3597591, 4.22206664 51.36451072, 4.21992833 51.36832287, 4.21826057 51.3722099, 4.21757767 51.37388563, 4.23069032 51.37435976, 4.24281066 51.37479669, 4.24280834 51.37379777, 4.24286056 51.37125123, 4.24316621 51.37117624, 4.24347174 51.37103796, 4.24370706 51.37068141, 4.24389255 51.37008905, 4.24410796 51.36954224, 4.24431884 51.36908472, 4.24455225 51.36867034, 4.24476385 51.36816514, 4.244982 51.36747491, 4.24517226 51.36665845, 4.24540901 51.36617172, 4.24569237 51.36597717, 4.24592257 51.36578608, 4.2461102 51.36545002, 4.24635875 51.36502087, 4.24667907 51.36452293, 4.24708426 51.3640573, 4.24739075 51.36374235, 4.24766016 51.36358285, 4.24793911 51.36349225, 4.24815035 51.36336243, 4.24830627 51.36318815, 4.24852848 51.36304903, 4.24884415 51.36296606, 4.24951494 51.36254585, 4.24964416 51.36235881, 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51.09750617, 2.57020795 51.09723151, 2.56944573 51.09695518, 2.56887674 51.09675658, 2.56842995 51.09660268, 2.5680176 51.09647763, 2.56757104 51.09632361, 2.56700253 51.09612513, 2.56624103 51.09584916, 2.5653578 51.09557474, 2.56444073 51.09527385, 2.56355774 51.09499836, 2.56279576 51.09471977, 2.56222296 51.09451795, 2.56176448 51.09436762, 2.56134045 51.09427106, 2.56095862 51.09406733, 2.56046546 51.09396732, 2.55987334 51.09381115, 2.55913198 51.09360456, 2.55839181 51.09334075, 2.55780911 51.09313667, 2.55735016 51.09297717, 2.5569334 51.09284997, 2.55648637 51.09269595, 2.55591881 51.09249771, 2.55515754 51.09222186, 2.55427432 51.09194732, 2.55335677 51.09164643, 2.55247355 51.09137177, 2.55171227 51.09109604, 2.55114472 51.09089768, 2.55069792 51.09074354, 2.55028105 51.09061611, 2.54982221 51.09045672, 2.54923892 51.09025395, 2.54849684 51.08999336, 2.54775381 51.08978987, 2.54716575 51.08962607, 2.54669464 51.08948565, 2.54626346 51.08931434, 2.54361111 51.09361111, 2.39027778 51.26916667, 2.37552528 51.29718832, 2.35365697 51.33872611, 2.30586236 51.42950965, 2.23833333 51.55777778, 2.25333333 51.61305556, 2.30586236 51.65721317, 2.48166667 51.805, 2.53933306 51.87611444, 3.08138889 51.55166667, 3.21222222 51.48472222, 3.29638889 51.45, 3.31192855 51.43093201, 3.33615505 51.40120481, 3.35388889 51.37944444, 3.36458333 51.37361111, 3.37040317 51.36696434, 3.36945856 51.366822)))"^^<http://www.opengis.net/ont/geosparql#wktLiteral> ;
#> <http://www.w3.org/ns/prov#hadPrimarySource> <http://www.marineregions.org> .The geometry is provided as WKT.
This is the same logic that gaz_geometry(format = "wkt")
uses to extract the geometry:
sparql <- "
PREFIX gsp: <http://www.opengis.net/ont/geosparql#>
SELECT ?o
WHERE {
?s gsp:asWKT ?o .
}"
rdf_query(bpns_geom, query = sparql)
#> # A tibble: 1 × 1
#> o
#> <chr>
#> 1 <http://www.opengis.net/def/crs/OGC/1.3/CRS84> MULTIPOLYGON (((4.24204865 51.…Extract the label in another language
Using the SPARQL syntax you can extract the label of the record in a specific language, if this is available. If not, the preferred label will be returned
Example: Get the Gazetteer entry for “Belgium” with MRGID
<http://marineregions.org/mrgid/14> and extract the
label in Dutch (nl) if available.
belgium <- gaz_search(14, rdf = TRUE)
sparql <- '
PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
SELECT (COALESCE(?altLabel, ?prefLabel) AS ?o)
WHERE {
OPTIONAL {
?s skos:altLabel ?altLabel .
filter langMatches(lang(?altLabel), "nl")
}
?s skos:prefLabel ?prefLabel .
}
'
rdf_query(belgium, query = sparql)
#> # A tibble: 1 × 1
#> o
#> <chr>
#> 1 BelgiëMirror the Marine Regions Gazetteer using the LDES Feed
The Marine Regions Gazetteer is accessible as RDF, and can be mirrored and synchronized via Linked Data Event Streams (LDES). This is described with high detail in:
Lonneville B. et al. (2021) Publishing the Marine Regions Gazetteer as a Linked Data Event Stream. S4BioDiv 2021. http://ceur-ws.org/Vol-2969/paper8-s4biodiv.pdf
Building such API in R is, at the moment, out of the scope of
mregions2. However, an interested user could make use of mregions2 and
rdflib::rdflib to mirror the Marine Regions Gazetteer. The
general approach is described below:
Initialize a database
By design, mregions2 stores the RDF triples in memory. This is because the package does not aim at replicating the Marine Regions Gazetteer, but only consult small subsets.
rdflib::rdflib allows to store the triples in a
database. This is further explained in
vignette("storage", package = "rdflib").
As an example, using a Virtuoso database backend is possible. Virtuoso is a popular open source database for RDF.
triplestore <- rdf(storage = "virtuoso",
user = "dba",
password = "dba",
dsn = "Local Virtuoso"
)
# Turn bpns into nquads
tmp <- tempfile(fileext = ".nq")
write_nquads(bpns, tmp)
# Parse bpns as nquads into the store
rdf_parse(tmp, format = "nquads", rdf = triplestore)Linked Data Event Stream Feed
The LDES feed is available at:
https://marineregions.org/feed
This offers fragmentation of the whole Marine Regions Gazetteer based
on the last modification time of the ?MRGID. It primary use
is to make it easy to have external caches, replications, or derived
indexes in an efficient and incremental way.
The implementation would start by fetching the feed as start page and
then follow the tree:relation paths down to pages that
contain only tree:member entries that are older than the
requested date.
Source: https://github.com/ropensci/mregions/pull/62#issuecomment-1091837752