2.2.2 [NamespacesXML1.1] Section 6.3, Uniqueness of Attributes

V0001:

The specification states:

 In XML documents conforming to this specification, no tag may contain two 
 attributes which: 
 1.   have identical names, or
 2.   have qualified names with the same local part and with prefixes which have 
 been bound to namespace names that are identical. 
  
 This constraint is equivalent to requiring that no element have two attributes with 
 the same expanded name.

MSXML3 and MSXML6

Two attributes with the same local part and with different prefixes are treated as different, even if the two different prefixes are bound to the same namespace name.

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