| 摘要 |
<p>The present invention relates to a method for identifying a data area D,E or D,G, reserved in accordance with a first specification, as useful data area G in accordance with a second specification.</p><p>It is an object of the invention to propose a method which enables compatibility between first specification and second specification, that is to say different versions of a specification.</p><p>This is achieved according to the invention by virtue of the fact that a header area D assigned to the reserved data area D,E or D,G is provided, which header area, in the event of transmission, is provided with a status information item "reserved" if the reserved data area E contains no or no checked useful data in accordance with the second specification, and is provided with a status information item "valid" if the reserved data area G contains useful data in accordance with the second specification, or from which header area a status information item is taken in the event of reception, the reserved data area E,G, in the case of status information "valid", being identified as containing valid useful data in accordance with the second specification, and, in the case of status information "reserved", being identified as containing no or no checked useful data in accordance with the second specification.
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