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2.1.5 [W3C-XSS] Section 3.11.4, Identity-constraint Definition Validation Rules

V0006:

The specification states:

4 [Definition:]  Call the subset of the ·target node set· for which all the 
{fields} evaluate to a node-set with exactly one member which is an element or 
attribute node with a simple type the qualified node set...

4.2 If the {identity-constraint category} is key, then all of the following 
must be true: ...

4.2.3 No element member of the ·key-sequence· of any member of the ·qualified 
node set· was assessed as ·valid· by reference to an element declaration 
whose {nillable} is true.

MSXML6

If an element of the key sequence of a qualified node set has a {nillable} attribute of value true, it can be valid.

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