screen.content

  CO | LineAnnotation | #PCDATA | FootnoteRef | XRef | Abbrev
  | Acronym | Citation | CiteRefEntry | CiteTitle | Emphasis
  | FirstTerm | ForeignPhrase | GlossTerm | Footnote | Phrase
  | Quote | Trademark | WordAsWord | Link | OLink | ULink
  | Action | Application | ClassName | Command
  | ComputerOutput | Database | Email | EnVar | ErrorCode
  | ErrorName | ErrorType | Filename | Function | GUIButton
  | GUIIcon | GUILabel | GUIMenu | GUIMenuItem | GUISubmenu
  | Hardware | Interface | InterfaceDefinition | KeyCap
  | KeyCode | KeyCombo | KeySym | Literal | Markup | MediaLabel
  | MenuChoice | MouseButton | MsgText | Option | Optional
  | Parameter | Prompt | Property | Replaceable | ReturnValue
  | SGMLTag | StructField | StructName | Symbol | SystemItem
  | Token | Type | UserInput | Anchor | Author | AuthorInitials
  | CorpAuthor | ModeSpec | OtherCredit | ProductName
  | ProductNumber | RevHistory | Comment | Subscript
  | Superscript | InlineGraphic | InlineEquation | Synopsis
  | CmdSynopsis
  | FuncSynopsis