there is an xml file with the contents of
<?xml version='1.0' encoding='UTF-8'?>
<request>
  <seller>
<id>550054</id>
  </seller>
  <category>
<id>1</id>
  </category>
  <lang>en</lang>
</request>
import vibe.vibe;
void main()
{
requestHTTP("http://site.com/balblabla.asp",
	(scope req) {
		// could add headers here before sending,
                    req.method = HTTPMethod.POST;
		req.contentType("application/xml");
		// write a POST body, or do similar things. ???? xml file
                    // how to send an xml file to an external resource (http://site.com/balblabla.asp)
	},
	(scope res) {
		logInfo("Response: %s", res.bodyReader.readAllUTF8());
	}
);
}
sorry I do not understand, please show an example