createFromTriples {datapack} | R Documentation |
Populate a ResourceMap with RDF relationships from data.frame.
Description
RDF relationships are added to a ResourceMap object from a data.frame that
contains RDF triples. For example, relationships can be exported from a DataPackage via
getRelationships
. The resulting data.frame is then read by createFromTriples
to create the ResourceMap.
Usage
createFromTriples(x, ...)
## S4 method for signature 'ResourceMap'
createFromTriples(
x,
relations,
identifiers,
resolveURI = NA_character_,
externalIdentifiers = list(),
creator = NA_character_,
...
)
Arguments
x |
a ResourceMap |
... |
(Additional parameters) |
relations |
A data.frame to read relationships from |
identifiers |
A list of the identifiers of data objects contained in the associated data package |
resolveURI |
A character string containing a URI to prepend to datapackage identifiers. |
externalIdentifiers |
A list of identifiers that are referenced from the package, but are not package members. |
creator |
A |
Details
The identifiers
parameter contains the identifiers of all data objects in the DataPackage.
For each data objects, additional relationships will be added that are required by the OAI-ORE specification,
for example a Dublin Core identifier statement is added. The resolveURI string value is prepended to
DataPackage member identifiers in the resulting resource map. If no resolveURI value
is specified, then 'https://cn.dataone.org/cn/v1/resolve' is used.
See Also
Examples
library(datapack)
dp <- new("DataPackage")
data <- charToRaw("1,2,3\n4,5,6")
do1 <- new("DataObject", id="id1", data, format="text/csv")
do2 <- new("DataObject", id="id2", data, format="text/csv")
dp <- addMember(dp, do1)
dp <- addMember(dp, do2)
dp <- insertRelationship(dp, subjectID="id1", objectIDs="id2",
predicate="http://www.w3.org/ns/prov#wasDerivedFrom")
relations <- getRelationships(dp)
resMapId <- sprintf("%s%s", "resourceMap_", uuid::UUIDgenerate())
resMap <- new("ResourceMap", id=resMapId)
resMap <- createFromTriples(resMap, relations, getIdentifiers(dp))