2.1.5 [XML] Section 3.1, Start-Tags, End-Tags, and Empty-Element Tags

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V0004:

The specification states:

 Well-formedness constraint: Unique Att Spec
 An attribute name MUST NOT appear more than once in the same start-tag or empty-
 element tag.

MSXML3 and MSXML6

An attribute can appear more than once in the same start-tag or empty-element tag. However, the first declaration takes precedence and the subsequent declarations are ignored.