It would be useful to have GeoPortal Server harvest the ISO metadata records from a THREDDS Data Server (http://www.unidata.ucar.edu/projects/THREDDS/tech/TDS.html) that has been outfitted with the ncISO service (http://www.ngdc.noaa.gov/eds/tds/).
Given a THREDDS catalog URL as an endpoint, GeoPortal Server would crawl the catalog, and harvest ISO metadata records from all datasets that have the ISO service. An example THREDDS catalog containg datasets with the ISO service is at:
(Use http://ferret.pmel.noaa.gov/geoide/geoIDECleanCatalog.html to view/navigate the catalog in your browser)
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