Add “DataLink” field to the JSON Schema and Metadata Form

[alcinnz]

POLDER and Google Datasets expect the JSON “DataDownload” field to link to the metadata site page which contains the link to the data (https://www.seanoe.org/data/00629/74128/) The Marine Geospatial Working Group’s DataMesh intitiave requires access to the data file (.nc, .txt etc) Addition of a “DataLink” field could ddress these two different requirements, and would look like this on the JSON where both “DataDownload” and “DataLink” are available:

"distribution": [ {
    "@type":"DataDownload",
    "contentUrl": https://www.seanoe.org/data/00629/74128/,
    "@type":"DataLink",
    "contentUrl": "https://data-marineinsitu.ifremer.fr/glo_multiparameter_nrt/history/CT/GL_PR_CT_EXEI0031.nc",
} ]

This would require that metadata form to be updated with the option to select “DataLink” from the Distribution Format’s dropdown so a user can separately specify the classification of the URL for metadata page holding the data, and the direct URL link to the data:

[ByronCinNZ]

Extend to include added guidance for JSON distribution output

[ByronCinNZ]

Complete 23-3-23 4 hours March invoice