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Simple URL harvesting (opendata)

This harvester connects to a remote server via a simple URL to retrieve metadata records. This allows harvesting opendata catalogs such as opendatasoft, ESRI, DKAN and more.

Adding a simple URL harvester

To create a Simple URL harvester go to Admin console > Harvesting and select Harvest from > Simple URL:

Providing the following information:

  • Identification

    • Node name and logo: A unique name for the harvester and, optionally, a logo to assign to the harvester.
    • Group: Group which owns the harvested records. Only the catalog administrator or users with the profile UserAdmin of this group can manage the harvester.
    • User: User who owns the harvested records.

  • Schedule: Scheduling options to execute the harvester. If disabled, the harvester must be run manually from the harvester page. If enabled, a scheduling expression using cron syntax should be configured (See examples).

  • Configure connection to Simple URL

    • URL - The URL of the server to be harvested. This can include pagination params like ?start=0&rows=20
    • Remote authentication: If checked, should be provided the credentials for basic HTTP authentication on the server.
    • Element to loop on: Propery/element containing a list of the record entries. (Indicated as an absolute path from the document root.) eg. /datasets
    • Element for the UUID of each record : Property containing the record id. eg. datasetid
    • Pagination parameters: (optional).
      • Element for the number of records to collect: Property indicating the total count of record entries. (Indicated as an absolute path from the document root.) eg. /nhits
      • From URL parameter: Property indicating the first record item on the current "page" eg. start
      • Size URL parameter: Property indicating the number of records containned in the current "page" eg. rows

  • Configure response processing for Simple URL

    • XSL transformation to apply: Name of the conversion schema to use, which must be available as XSL on the GeoNetwork instance. eg. OPENDATASOFT-to-ISO19115-3-2018

      Note

      GN looks for schemas by name in https://github.com/geonetwork/core-geonetwork/tree/4.0.x/web/src/main/webapp/xsl/conversion/import. These schemas might internally include schemas from other locations like https://github.com/geonetwork/core-geonetwork/tree/4.0.x/schemas/iso19115-3.2018/src/main/plugin/iso19115-3.2018/convert. To indicate the fromJsonOpenDataSoft schema for example, from the latter location directly in the admin UI the following syntax can be used: schema:iso19115-3.2018:convert/fromJsonOpenDataSoft.

    • Batch edits: (Optional) Allows to update harvested records, using XPATH syntax. It can be used to add, replace or delete element.

    • Category: (Optional) A GeoNetwork category to assign to each metadata record.
    • Validate records before import: Defines the criteria to reject metadata that is invalid according to XML structure (XSD) and validation rules (schematron).
      • Accept all metadata without validation.
      • Accept metadata that are XSD valid.
      • Accept metadata that are XSD and schematron valid.

  • Privileges - Assign privileges to harvested metadata.

Sample configurations

Sample configuration for opendatasoft

  • Element to loop on - /datasets
  • Element for the number of records to collect : /nhits
  • Element for the UUID of each record : datasetid
  • From URL parameter : start
  • Size URL parameter : rows
  • XSL transformation to apply : OPENDATASOFT-to-ISO19115-3-2018

Sample configuration for ESRI

  • Element to loop on - /dataset
  • Element for the number of records to collect : /result/count
  • Element for the UUID of each record : landingPage
  • From URL parameter : start
  • Size URL parameter : rows
  • XSL transformation to apply : ESRIDCAT-to-ISO19115-3-2018

Sample configuration for DKAN

  • Element to loop on - /result/0
  • Element for the number of records to collect : /result/count
  • Element for the UUID of each record : id
  • From URL parameter : start
  • Size URL parameter : rows
  • XSL transformation to apply : DKAN-to-ISO19115-3-2018