datapack (version 1.0.0)

createFromTriples: 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, ...)
"createFromTriples"(x, relations, identifiers, resolveURI = as.character(NA), ...)

Arguments

x

a ResourceMap

...

(Additional parameters)

relations

A data.frame to read relationships from

identifiers

A list of the identifiers of data objects cotained in the associated data package

resolveURI

A character string containing a URI to prepend to datapackage identifiers.

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

ResourceMap-class

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 <- addData(dp, do1)
dp <- addData(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))