2.1.1526 Part 1 Section 21.2.2.149, protection (Protection)

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a.   The standard states that if the chart is on a protected worksheet or chart sheet, then these settings shall control how a user is able to interact with the chart.

In Office, this element to controls how a user is permitted to interact with the chart regardless of whether the chart is on a protected worksheet or chart sheet.

b.   The standard states the protection element supports the child elements specified.

Office only successfully writes out the selection child element.  The other child elements have not been implemented.