[YANG] insert and key attributes

Hi,

1) sec. 7.8.6 mentions the 'key' attribute (great, another
    overloaded term ;-) but this is not formally defined anywhere.
    The terse definition of the 'insert' attribute is not a formal
    definition either.  In general, all the new requirements
    that YANG places on NETCONF agents is scattered throughout
    the document, and not entirely obvious.

2) para 4 in 7.8.6 says if insert is missing, then it defaults
    to last.  Even in a list indexed by an integer.  This seems
    strange to me, to use an integral key and then ignore the actual
    base type, but I guess 'ordered-by-user' implies that the base type
    of the key has no meaning to the agent.

3) The last example in 7.8.7 is confusing.
    (There is a typo "to move a the new user 'barney'".)
    If 'barney' was already inserted after 'fred' (previous page)
    then the merge of 'barney' before 'fred' will fail in NETCONF.
    There is no move operation in NETCONF.  You cannot edit the
    value of a key.  The example would actually have no affect
    in NETCONF, since the <name> field was already set to 'barney'.


Andy


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