Issue 7553: Eventing - GetStatus Fault Message (action item 102)

Following discussions from Tuesday's call, here's a proposed fix for 
http://www.w3.org/Bugs/Public/show_bug.cgi?id=7553 action item 102 
http://www.w3.org/2002/ws/ra/tracker/actions/102

1) Add text to 4.3 GetStatus:
"If the event source is unable to perform the request because the 
subscription is not valid, the request MUST fail and the subscription 
manager MUST generate a wse:InvalidSubscription fault.""

2) Add the following fault section:

6.13 InvalidSubscriotion
This fault is generated when a request specifies a subscription that is 
not valid.
[Code]           s12:Sender
[Subcode]   wse:InvalidSubscription
[Reason]     The subscription is not valid
[Detail]         <wse:SubscriptionExpired>? 
                       Optional.

3) Extend section 6.1 to correctly detail the subscriptionExpired element:

6.1 Fault Detail Elements
The following elements are used to convey additional information in the 
faults.
6.1.1 RetryAfter 
/wse:RetryAfter
    This element (whose content is of type xs:unsignedLong) is a suggested 
minimum duration in milliseconds to wait before retransmitting the 
message. Omission of this element indicates that a retry is never likely 
to succeed. 
/wse:RetryAfter/@any
    Optional extensibility attributes that do not affect processing. 
6.1.2 SubscriptionExpired
/wse:SubscriptionExpired
    This empty element MAY be used by a subscription manager to indicate 
that it was unable  to process a request because the subscription to which 
the request refers has expired. 
This is an optional element.  Implementations are not required to retain 
information about expired subscriptions.
/wse:SubscriptionExpired/@any
    Optional extensibility attributes that do not affect processing

4) The current wording in the spec implies that expired subscriptions are 
valid.  This contradicts the above usage of faults (where expired 
subscriptions are not valid).  Replace the following text in 4.3 
GetStatus:
"If the subscription is valid and has not expired, the subscription 
manager MUST reply with a response of the following form: "
with 
"A subscription is not valid if it has expired.  If the subscription is 
valid, the subscription manager MUST reply with  a response of the 
following form: "





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