Context

The BALD CLI and library allow you to specify contextual prefix mappings to be resolved in the NetCDF metadata as described in the draft specification.

CLI

You can provide the context as a set of JSON-LD files. Use the --context or -c option to specify the locations of the context files as a comma-delimited list.

Example

java -jar bald-cli.jar --context /path/to/context.json /path/to/netcdf.nc /path/to/graph.ttl

Library

For simple usage, use the NetCdfLd.convert method as described here.

Alternatively, you can provide the context as an Apache Jena prefix mapping. Pass a prefix mapping (or list of mappings) to the ModelContext.create method to create a ModelContext instance. You may also create your own implementation of ModelContext.

You can pass this instance to the NetCdfBinaryArray.create method to create a binary array with the given context.

Note that you can pass both a contextual prefix mapping, and an alias definition to create a BinaryArray with both.

Example

PrefixMapping prefix = ModelFactory.createDefaultModel().read("/path/to/context.json", "json-ld");
ModelContext context = ModelContext.create(prefix);
BinaryArray ba = NetCdfBinaryArray.create("/path/to/input.nc", "http://test.binary-array-ld.net/example", context, null, null);
Model model = ModelBinaryArrayConverter.convert(ba);

try (OutputStream output = new FileOutputStream("/path/to/output.ttl")) {
    model.write(output, "ttl");
}