[Css-csts] extension-chaining

[Ray, Timothy J. (GSFC-5830)]

Dear WG Members,

The general question is this:  "If a procedure does not make use of an extension provided by a lower level, does the extension-chain end at that procedure?"     The next paragraph provides an example.

The generic Stop-Invocation provides an extension for use by the next higher layer (e.g. the Buffered Data Delivery procedure).   The Buffered Data Delivery (BDD) procedure does not make use of that extension capability.  Does that mean that the BDD procedure does not provide an extension for use by the next higher layer (i.e. procedures that are derived from the BDD procedure, and services that use the BDD procedure)?

Best regards,
Tim
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