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Protocol of a link, taken from its URL where the catalogue is unusable

Source: R/find_wfs.R
gn_link_protocol.Rd

A GeoNetwork link declares its protocol in its own field, but the GDI Berlin records do not fill it in: their WMS and WFS links repeat the description there, so link_protocol reads "Darstellungsdienst - ALKIS Berlin (WMS)" where "OGC:WMS" is meant, and their viewer links leave it empty. Filtering on the declared value therefore drops every OGC service in the catalogue.

Usage

gn_link_protocol(url, protocol = NA_character_)

Arguments

url

link URL, NA allowed.

protocol

declared protocol, used where the URL says nothing.

Value

character vector, as long as url.

Details

The endpoint URL carries the same information and is machine-readable: the Berlin services answer under /services/<type>/<name> and name the type again in a service= query parameter. Where the URL says what the service is, it wins; otherwise the declared protocol is kept as it is, so a catalogue that fills the field in properly is unaffected.

Examples

kwb.geoportal:::gn_link_protocol(
  "https://gdi.berlin.de/services/wfs/kanal?service=WFS",
  "Downloaddienst - Kanalisation (WFS)"
)
#> [1] "OGC:WFS"