In cboettig/nexld: 'NeXML' in 'JSON-LD'

knitr::opts_chunk$set(
  collapse = TRUE,
  comment = NA,
  fig.path = "README-"
)

nexld

The goal of nexld is to serialize NeXML xml data into JSON-LD.

Installation

You can install nexld from github with:

# install.packages("devtools")
devtools::install_github("cboettig/nexld")

Heads up!

Package is in purely exploratory stage at this time, function api likely to change.

Example

Let's convert a simple NeXML file into JSON-LD:

library(nexld)
ex <- system.file("extdata/example.xml", package = "nexld")
json <- xml_to_json(ex)

tmp <- tempfile()
json_to_xml(json, tmp)
nexml_validate(tmp)

Obviously this is just a preliminary mapping to start discussion. The convention is relatively self-explanatory.

1. Repeated nodes (edge, otu etc) are replaced by a list of such nodes.
2. meta elements are collapsed into namespaced properties
3. A @context is constructed from the xmlns namespaces
4. Tweaks for tidy JSON-LD:
5. XML comment nodes are dropped. Round trip will not restore these.
6. about attributes are dropped (as they are redundant to the nesting in JSON-LD). Round trip should restore these.

Why would we want to do this?

Linked-Data NeXML

The NeXML standard is only half-semantic, in that metadata (in RDFa-style meta elements) can be serialized to RDF (e.g. via an XSLT stylesheet), but the actual NeXML data cannot.

cboettig/nexld documentation built on Sept. 18, 2019, 7:11 a.m.