Is there an example that illustrates how to use types with extensibility and values with unknown extension additions? Is there an example that illustrates the "RelaySafe" Mechanism?

Yes, there is an example that illustrates how to work with extensible types. The example illustrates the -relaySafe ASN.1 compiler option. With this option the ASN.1/Java compiler generates information that causes the unknown extension additions to be preserved by the decoder for each ASN.1 type which is extensible. The relay.asn file consists of 2 modules, one of which has been defined as version 1 with possible extensions and the other of which has been defined as version 2 with a known extension. The V2Peer.java and V1Peer.java represent the two versions, sending a message back and forth demonstrating the communication between versions where one version knows about extensions that are unknown to the other version.

To make it easier for you to run the example from the command line, two scripts are included, a Unix .sh and a Windows .bat.

To run it on a Unix platform, change directory to the relay directory and type:

./run.sh

To run it on Windows, change directory to the relay directory and type:

run

To do a cleanup on Unix, type:

./run.sh cleanup

To do a cleanup on Windows, type:

run cleanup

To download, click the file below:

• relay.zip 7KB

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