def xsd_file(filename)
      xsd_file_location = File.join(DineroMailIpn.resources_path, "/validation/xsd/#{filename}")
      xsd_file = File.read(xsd_file_location)
      xsd_file
    end
def xsd_file(filename)
      xsd_file_location = File.join(DineroMailIpn.resources_path, "/validation/xsd/#{filename}")
      xsd_file = File.read(xsd_file_location)
      xsd_file
    end
Locates an XSD file.

 @param filename [String] the XSD filename