New answers tagged gml
See this page: http://dev.openlayers.org/examples/gml-layer.html perhaps helps you.
As user30184 said, the importer extension has been designed exactly for this job, and will convert the data into the format of the chosen target store (e.g., will import the data into postgis or oracle for you). WFS-T is more geared towards single feature editing than "mass import" and can only handle GML anyways.
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