Hub feature: Allow using externally defined dataflows > data visualisation and download
In the DE search indexer, consider an SDMX data source that contains the categoryscheme and categorisations for the dataflows, which are to be indexed, but that contains only the stubs of the dataflows (without content, e.g. without link to its DSD). These dataflows are stored externally, thus the stubs include the references to the original full dataflow definition with the following artefact properties: isExternalReference=true, and link{external structure link}. In such as case, the DE search indexer must use the given external link to the dataflow rather then self-constructing the URL for the dataflow structure query from the mentioned SDMX data source.
In the DE data view page (as well as the Viewer application), in case the first call to retrieve the dataflow information returns again only the stubs of the dataflow together with an external reference to the original full dataflow definition, then a second call to the external service URL must be made to retrieve the structure information. Also the data query must use this dataflow-specific external service.
Example of stub with external reference:
{
"meta": {
# meta object #
},
"data": {
"dataflows": [
{
"id": "DF_EXAMPLE",
"agencyID": "ECB.DISS",
"version": "1.0",
"name": "Dataflow name",
"names": {
"en": "Dataflow name"
},
"isFinal": true,
"isExternalReference": true,
"links": [
{
"href": "https://registry.sdmx.org/ws/rest/dataflow/ECB.DISS/DF_EXAMPLE/1.0",
"rel": "dataflow",
"urn": "urn:sdmx:org.sdmx.infomodel.datastructure.dataflow=ECB.DISS:DF_EXAMPLE(1.0)"
}
]
}
]
}
}
Objective: change the structure retrieval algorithm of the visualisation so that externally hosted dataflows can still be viewed
Example external dataflow: http://nsi-stable-siscc.redpelicans.com/rest/dataflow/ILO/DF_SDG_ALL_SDG_A871_SEX_AGE_RT/1.0