2.7.2.1 Relayed Infoset
This section describes the behavior of SOAP forwarding intermediaries with respect to preservation of the XML infoset properties of a relayed SOAP message.
Unless overridden by the processing of SOAP features at an intermediary (see 2.7.2 SOAP Forwarding Intermediaries), the following rules apply:
All XML infoset properties of a message MUST be preserved, except as specified in rules 2 through 22.
上面定义了哪些Infoset在relay时可以被新消息采用，哪些可以放弃，请问谁知道这些infoset具体在什么情况下被采用/放弃？谁能举个例子
The element information item for a header block targeted at an intermediary MAY be removed, by that intermediary, from the [children] property of the SOAP Header element information item as detailed in 2.7.2 SOAP Forwarding Intermediaries.
Element information items for additional header blocks MAY be added to the [children] property of the SOAP Header element information item as detailed in 2.7.2 SOAP Forwarding Intermediaries.
In this case, a SOAP Header element information item MAY be added, as the first member of the [children] property of the SOAP Envelope element information item, if it is NOT already present.
White space character information items MAY be removed from the [children] property of the SOAP Envelope element information item.
White space character information items MAY be added to the [children] property of the SOAP Envelope element information item.
White space character information items MAY be removed from the [children] property of the SOAP Header element information item.
White space character information items MAY be added to the [children] property of the SOAP Header element information item.
Comment information items MAY be added to the [children] property of the SOAP Envelope element information item.
Comment information items MAY be removed from the [children] property of the SOAP Envelope element information item.
Comment information items MAY be added to the [children] property of the SOAP Header element information item.
Comment information items MAY be removed from the [children] property of the SOAP Header element information item.
Attribute information items MAY be added to the [attributes] property of the SOAP Envelope element information item.
Attribute information items MAY be added to the [attributes] property of the SOAP Header element information item.
Attribute information items MAY be added to the [namespace attributes] property of the SOAP Envelope element information item.
Attribute information items MAY be added to the [namespace attributes] property of the SOAP Header element information item.
SOAP role attribute information items that are present in the [attributes] property of SOAP header block element information items may be transformed as described in 5.2.2 SOAP role Attribute.
SOAP mustUnderstand attribute information items that are present in the [attributes] property of SOAP header block element information items may be transformed as described in 5.2.3 SOAP mustUnderstand Attribute.
SOAP relay attribute information items that are present in the [attributes] property of SOAP header block element information items may be transformed as described in 5.2.4 SOAP relay Attribute.
The [base URI] property of the document information item need not be maintained.
The [base URI] property of element information items MAY be changed or removed.
The [character encoding scheme] property of the document information item MAY be changed or removed.
All namespace information items in the [in-scope namespaces] of element information items MUST be preserved. Additional namespace information items MAY be added.
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请问关于soap 1.2 relay消息时infoset的处理问题
