What is the XCode Interface Builder “Document” Section

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It’s saving an attributed string with a key of userComments to the storyboard file.

<attributedString key="userComments">
    <fragment content="These are the comments I entered in the notes section of Interface Builder">
        <attributes>
            <font key="NSFont" size="11" name="LucidaGrande"/>
            <paragraphStyle key="NSParagraphStyle" alignment="left" lineBreakMode="wordWrapping" baseWritingDirection="natural"/>
        </attributes>
    </fragment>
</attributedString>

I don’t know of any practical use of this, though. It would be nice to be able to retrieve this programmatically, though.