Determines how document revisions are viewed.
None.
      
        | Attribute | Type | Required | Description | Possible Values | 
      
        | markup | onOffType | optional | Gets or sets displays track changes markup in document. Defaults to true if not specified. |  | 
      
        | comments | onOffType | optional | When viewing markup, displays annotations (comments) in document. Defaults to true if not specified. |  | 
      
        | ins-del | onOffType | optional | When viewing markup, displays track insertions and deletions in document. Defaults to true if not specified. |  | 
      
        | formatting | onOffType | optional | When viewing markup, displays formatting changes markup in document. Defaults to true if not specified. |  | 
      
        | ink-annotations | onOffType | optional | When viewing markup, displays annotations (comments) in document. Defaults to true if not specified. |  |