DAP4: XML Data Service
From OPeNDAP Documentation
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Overview
Return requested data in an XML document.
Request
The XML Data Service is invoked by appending the suffix .xdap
to the file part of the dataset's referent (aka base) URL and then dereferencing the new URL. The XML Data Service accepts an optional query string (constraint expression), If present a query string (constraint expression) will be handled as it would for Data Service request.
Response
The XML Data response is a repackaging of the data requested from underlying data resource into anXML document that is based on the DAP4 Dataset document. Essentially the Dataset XML document is marked up to add data values.