To identify the layer or store for a WFS, WMS, or WCS web service so the application can construct the full web service link
Only the layer name is added here. The base service endpoint URLs (e.g. “https://maps-public.geo.nyu.edu/geoserver/sdr/wms”) are added to the References field.
This value is only used when you have WxS services listed in your references field (dct_references_s). The WxS Identifer is used to point to specific layers within an OGC geospatial web service. This field is not used for ArcGIS Rest Services.