|  | HTML_STRICT = ('html', '-//W3C//DTD HTML 4.01//EN', 'http://ww... | 
    |  | HTML_TRANSITIONAL = ('html', '-//W3C//DTD HTML 4.01 Transition... | 
    |  | HTML_FRAMESET = ('html', '-//W3C//DTD HTML 4.01 Frameset//EN',... | 
    |  | HTML = ('html', '-//W3C//DTD HTML 4.01//EN', 'http://www.w3.or... | 
    |  | HTML5 = ('html', None, None) | 
    |  | XHTML_STRICT = ('html', '-//W3C//DTD XHTML 1.0 Strict//EN', 'h... | 
    |  | XHTML_TRANSITIONAL = ('html', '-//W3C//DTD XHTML 1.0 Transitio... | 
    |  | XHTML_FRAMESET = ('html', '-//W3C//DTD XHTML 1.0 Frameset//EN'... | 
    |  | XHTML = ('html', '-//W3C//DTD XHTML 1.0 Strict//EN', 'http://w... | 
    |  | XHTML11 = ('html', '-//W3C//DTD XHTML 1.1//EN', 'http://www.w3... | 
    |  | SVG_FULL = ('svg', '-//W3C//DTD SVG 1.1//EN', 'http://www.w3.o... | 
    |  | SVG_BASIC = ('svg', '-//W3C//DTD SVG Basic 1.1//EN', 'http://w... | 
    |  | SVG_TINY = ('svg', '-//W3C//DTD SVG Tiny 1.1//EN', 'http://www... | 
    |  | SVG = ('svg', '-//W3C//DTD SVG 1.1//EN', 'http://www.w3.org/Gr... |