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    A Node is any entity connected to a Network.
    
    type
        A node can define itself as a router node or a copy node.  Routers
    assume responsibility for the transaction.  Copy Nodes request to only
    be aware of the transaction.
    
    itemDetailsRequired
        Intermediary Nodes may want to support special operations without
    having to store specific information required to fulfill that operation.
    This attribute tells the previous node to send ItemDetail information
    when performing a PunchOutSetupRequest edit/inspect operation.
-->
<!ELEMENT Node (Credential+)>
<!ATTLIST Node
    type (copy | route) #REQUIRED
    itemDetailsRequired (yes) #IMPLIED
>


<!--
    Identifies the previous document in the situation that a router node
    forwards a message or request on to a more distant node.
    
    payloadID
        The payloadId of the original document.
-->
<!ELEMENT OriginalDocument EMPTY>
<!ATTLIST OriginalDocument
    payloadID %string; #REQUIRED
>

<!--
    A textual string representing who the UserAgent is conducting the cXML
    conversation. Analogous to UserAgent for HTTP conversations.
-->
<!ELEMENT UserAgent (#PCDATA)>

<!--
    DEPRECATED 
    Do not use this element.
-->
<!ELEMENT DigitalSignature ANY>
<!ATTLIST DigitalSignature
    type      %string;  "PK7 self-contained"
    encoding  %string;  "Base64"
>

<!--
    A shared secret. Typically, this is a username/password type of secret
    exchanged through a secure transport before communication takes place.
-->
<!ELEMENT SharedSecret ANY>

<!--
    Represents an identity for a credential.

    lastChangedTimestamp
       When the underlying object last changed in the originating system.
       This is used in cases where the same object (e.g. a buyer
       organization) is replicated, and kept synchronized, across two
       systems.
-->
<!ELEMENT Identity ANY>
<!ATTLIST Identity
    lastChangedTimestamp  %datetime.tz;  #IMPLIED
>

<!--
    A Credential Message Authentication Code (MAC).  This is used in
    situations where one party (the sender) must prove to another (the
    receiver) that it is authenticated by a shared secret with a third
    party trusted by both.

    The MAC should be computed by the trusted third party and
    transferred to the sender.  The MAC should be opaque to the sender
    (i.e., it should be secure and non-reversible).  The MAC should
    use as its inputs enough information to accomplish the following
    goals:

    (1) The MAC must prove to the receiver that it really originated
    with the trusted third party.  E.g., the MAC could use a shared
    secret between the receiver and the trusted third party as its
    secret key.

    (2) The MAC should be usable only by a certain sender.  E.g., the
    MAC could authenticate an identifier for the sending organization.

    (3) The MAC should prove that the sender is authorized to send on
    behalf of the From organization.  E.g., the MAC could authenticate
    an identifier for the From organization.

    (4) The MAC should limit the risk of the MAC being compromised and
    used to impersonate the sender by another party communicating with
    the receiver.  E.g., the MAC could authenticate an expiration date
    or sequence number.

    type
        An implementation-dependent identifier for the exact data
        being authenticated and the method in which it is formatted
        for authentication.  Currently the only supported value is
        "FromSenderCredentials".

    algorithm
        An implementation-dependent identifier for the exact MAC
        algorithm used on the data.  Currently the only supported
        value is "HMAC-SHA1-96".

    creationDate
        The time at which this MAC was issued.  The receiver must not
        accept the MAC before this time.

    expirationDate
        The time at which this MAC expires.  The receiver must not
        accept the MAC after this time.
-->
<!ELEMENT CredentialMac (#PCDATA)>
<!ATTLIST CredentialMac
    type           %string;      #REQUIRED
    algorithm      %string;      #REQUIRED
    creationDate   %datetime.tz; #REQUIRED