Update Data Package support to version 2 or later in DP Guide

[tucotuco]

The Darwin Core Data Package Guide currently explicitly states the target version for the underlying Data Package Specification is version 1:

All requirements and examples in this guide use version 1 of the Data Package specification, which is RECOMMENDED for DwC-DPs.

We would like to future-proof the DP Guide and update the version recommendation to use specification version 2 as the minimum. This requires the following updates in the guide:

1. Update version recommendation:

   All requirements and examples in this guide use version 1 version 2 or higher of the Data Package specification, which is RECOMMENDED for DwC-DPs.

2. Update package.profile requirement:

   The descriptor MUST have a profile $schema property, with a URL referencing the profile the dataset conforms to. The $schema property MUST follow the Data Package specification. This MUSTIts value MUST be a string representing the URL to a DwC-DP profile served from http://rs.tdwg.org. The URL MUST include the version of the profile (e.g., http://rs.tdwg.org/dwc-dp/1.0/dwc-dp-profile.json, where 1.0 is the version).

3. Add new resource.$schema requirement:

   A DwC-DP table MUST have a $schema property, indicating what version of the Data Resource specification is used. The $schema property MUST follow the Data Resource specification. Its value MUST be https://datapackage.org/profiles/2.0/dataresource.json (where 2.0 is the version, which MAY be higher than 2.0).

4. Update resource.profile requirement:

   A DwC-DP table MUST have a profile type property, indicating the type of resource. The type property MUST follow the Data Resource specification. The profile property MUST be the value Its value MUST be tabular-data-resource table, thereby indicating that it follows the Tabular Data Resource specification.

5. Update all references from https://specs.frictionlessdata.io to the correct links in the Data Package v2 specification https://datapackage.org

6. Update example (non-normative):

   "$schema": "http://rs.tdwg.org/dwc-dp/1.0/dwc-dp-profile.json", <-- ADDED
   "profile": "http://rs.tdwg.org/dwc-dp/1.0/dwc-dp-profile.json",

   For the resources:

    {
      "$schema": "https://datapackage.org/profiles/2.0/dataresource.json", <-- ADDED
      "name": "event",
      "path": "event.csv",
      "type": "table", <-- ADDED ("profile": "tabular-data-resource" REMOVED)
      ...
      "foreignKeys": [
          {
            "fields": ["eventID"], <-- UPDATED TO ARRAY
            "predicate": "happened during",
            "reference": {
              "resource": "event",
              "fields": ["eventID"] <-- UPDATED TO ARRAY
            }
          }
        ]

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If approved, the following should be updated (no need for public review):

• dwc-dp-profile.json
• all table schemas
  • Add "$schema": "https://datapackage.org/profiles/2.0/tableschema.json"