notebook/jq_maps.md

In cboettig/emld: Ecological Metadata as Linked Data

Mapping between Schema.Org and EML via JQ

We will use J-Query as XSLT-like stylesheets. These two examples shipping in this package are currently a work in progress:

library(jqr)

eml_to_schema <- readr::read_file(system.file("jq/eml_to_schema.jq", package="emld"))
schema_to_eml <-  readr::read_file(system.file("jq/schema_to_eml.jq", package="emld"))

Let's map a more complete EML document into schema.org:

eml <- readr::read_file("https://raw.githubusercontent.com/cboettig/emld/master/inst/extdata/hf205.json")
jq(eml, eml_to_schema)

## {
##     "id": "HF205",
##     "type": null,
##     "temporalCoverage": "2012-06-01/2013-12-31",
##     "spatialCoverage": {
##         "description": "Harvard Forest Greenhouse, Tom Swamp Tract (Harvard Forest)",
##         "geo": {
##             "box": "+42.42 -72.29 +42.55 -72.10"
##         }
##     }
## }

Convert a dataset marked up in http://schema.org/Dataset terms into EML

schema <- readr::read_file("../inst/extdata/schema-org-dataset.json")

jq(schema, schema_to_eml)

## {
##     "@id": null,
##     "@type": "Dataset",
##     "coverage": {
##         "temporalCoverage": {
##             "rangeOfDates": {
##                 "beginDate": "1950-01-01",
##                 "endDate": "2013-12-18"
##             }
##         },
##         "geographicCoverage": {
##             "geographicDescription": null,
##             "boundingCoordinates": {
##                 "westBoundingCoordinate": "-65.0",
##                 "eastBoundingCoordinate": "172.0",
##                 "northBoundingCoordinate": "72.0",
##                 "southBoundingCoordinate": "18.0"
##             }
##         }
##     }
## }

cboettig/emld documentation built on Oct. 29, 2020, 3:46 p.m.