Each rOpenSci package which accesses a particular dataset should include a data.json file. This file should be placed in the package root directory and be added to .Rbuildignore. The data.json file should conform to Google’s Structured Data format. Users can check their document interactively using the Structured Data Testing Tool. A list of all recognized Dataset properties (metadata fields) can be found at http://schema.org/Dataset.

If ncessary, multiple datasets (and other objects such as the DataCatalog) can be documented in a single JSON file by creating a separate @context element for the schema.org context and a @graph element containing an array of Dataset type objects, e.g.

` { “@context”: “http:/schema.org”, “@graph”: [ { “@type”: “Dataset”, … }, { “@type”: “Dataset”, … }, …] }