text: #import <Foundation/Foundation.h>
  
  extern NSString * const AshtonAttrColor;
  extern NSString * const AshtonAttrBackgroundColor;
  extern NSString * const AshtonAttrFont;
  extern NSString * const AshtonAttrLink;
  extern NSString * const AshtonAttrParagraph;
  extern NSString * const AshtonAttrStrikethrough;
  extern NSString * const AshtonAttrStrikethroughColor;
  extern NSString * const AshtonAttrUnderline;
  extern NSString * const AshtonAttrUnderlineColor;
  extern NSString * const AshtonAttrVerticalAlign;
  extern NSString * const AshtonAttrBaselineOffset;
  
  extern NSString * const AshtonFontAttrTraitBold;
  extern NSString * const AshtonFontAttrTraitItalic;
  extern NSString * const AshtonFontAttrFeatures;
  extern NSString * const AshtonFontAttrPointSize;
  extern NSString * const AshtonFontAttrFamilyName;
  extern NSString * const AshtonFontAttrPostScriptName;
  
  extern NSString * const AshtonParagraphAttrTextAlignment;
  extern NSString * const AshtonParagraphAttrTextAlignmentStyleLeft;
  extern NSString * const AshtonParagraphAttrTextAlignmentStyleRight;
  extern NSString * const AshtonParagraphAttrTextAlignmentStyleCenter;
  extern NSString * const AshtonParagraphAttrTextAlignmentStyleJustified;
  
  extern NSString * const AshtonStrikethroughStyleSingle;
  extern NSString * const AshtonStrikethroughStyleThick;
  extern NSString * const AshtonStrikethroughStyleDouble;
  
  extern NSString * const AshtonUnderlineStyleSingle;
  extern NSString * const AshtonUnderlineStyleThick;
  extern NSString * const AshtonUnderlineStyleDouble;
  