<Locked> (Lock Toggle)
This element specifies that the object is locked when the sheet is protected.  If omitted, the object is assumed to be locked.  If this element is specified without a value, it is assumed to be true.  This is a general-use element.
example: 
<x:ClientData … > …
  <x:Locked>False</x:Locked>
</x:ClientData>
The possible values for this element are defined by the ST_TrueFalseBlank simple type (§6.4.3.3).
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