In part 1, 2.2:

SOAP nodes MUST NOT act in the role of the special SOAP actor named "http://www.w3.org/2001/06/soap-envelope/actor/none".

In part 1, 4.2.2:

At a SOAP receiver, the special URI "http://www.w3.org/2001/06/soap-envelope/actor/none" indicates that the SOAP header block is not targetted at any SOAP node. This allows data which is common to several blocks to be referenced from them, without being processed.

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