CommentThread 
    A collection of comments representing a conversation at a particular range in a document.
Properties
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                  Whether the thread should be collapsed or expanded when opening the document. Defaults to Collapsed.
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                  The ordered comments of the thread.
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                  Context value of the comment thread. This can be used to contribute thread specific actions. For example, a comment thread is given a context value as editable. When contributing actions to comments/commentThread/title using menus extension point, you can specify context value for key commentThread in when expression like commentThread == editable.
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                  The optional human-readable label describing the Comment Thread
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                  The optional state of a comment thread, which may affect how the comment is displayed.