cosa vuol dire questo codice ? - Versione stampabile

Codice:
<!--

   Extensible HTML version 1.0 Transitional DTD



   This is the same as HTML 4 Transitional except for

   changes due to the differences between XML and SGML.



   Namespace = http://www.w3.org/1999/xhtml



   For further information, see: http://www.w3.org/TR/xhtml1



   Copyright (c) 1998-2002 W3C (MIT, INRIA, Keio),

   All Rights Reserved. 



   This DTD module is identified by the PUBLIC and SYSTEM identifiers:



   PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

   SYSTEM "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"



   $Revision: 1.2 $

   $Date: 2002/08/01 18:37:55 $



-->



<!--================ Character mnemonic entities =========================-->



<!ENTITY % HTMLlat1 PUBLIC

   "-//W3C//ENTITIES Latin 1 for XHTML//EN"

   "xhtml-lat1.ent">

%HTMLlat1;



<!ENTITY % HTMLsymbol PUBLIC

   "-//W3C//ENTITIES Symbols for XHTML//EN"

   "xhtml-symbol.ent">

%HTMLsymbol;



<!ENTITY % HTMLspecial PUBLIC

   "-//W3C//ENTITIES Special for XHTML//EN"

   "xhtml-special.ent">

%HTMLspecial;



<!--================== Imported Names ====================================-->



<!ENTITY % ContentType "CDATA">

    <!-- media type, as per [RFC2045] -->



<!ENTITY % ContentTypes "CDATA">

    <!-- comma-separated list of media types, as per [RFC2045] -->



<!ENTITY % Charset "CDATA">

    <!-- a character encoding, as per [RFC2045] -->



<!ENTITY % Charsets "CDATA">

    <!-- a space separated list of character encodings, as per [RFC2045] -->



<!ENTITY % LanguageCode "NMTOKEN">

    <!-- a language code, as per [RFC3066] -->



<!ENTITY % Character "CDATA">

    <!-- a single character, as per section 2.2 of [XML] -->



<!ENTITY % Number "CDATA">

    <!-- one or more digits -->



<!ENTITY % LinkTypes "CDATA">

    <!-- space-separated list of link types -->



<!ENTITY % MediaDesc "CDATA">

    <!-- single or comma-separated list of media descriptors -->



<!ENTITY % URI "CDATA">

    <!-- a Uniform Resource Identifier, see [RFC2396] -->



<!ENTITY % UriList "CDATA">

    <!-- a space separated list of Uniform Resource Identifiers -->



<!ENTITY % Datetime "CDATA">

    <!-- date and time information. ISO date format -->



<!ENTITY % Script "CDATA">

    <!-- script expression -->



<!ENTITY % StyleSheet "CDATA">

    <!-- style sheet data -->



<!ENTITY % Text "CDATA">

    <!-- used for titles etc. -->



<!ENTITY % FrameTarget "NMTOKEN">

    <!-- render in this frame -->



<!ENTITY % Length "CDATA">

    <!-- nn for pixels or nn% for percentage length -->



<!ENTITY % MultiLength "CDATA">

    <!-- pixel, percentage, or relative -->



<!ENTITY % Pixels "CDATA">

    <!-- integer representing length in pixels -->



<!-- these are used for image maps -->



<!ENTITY % Shape "(rect|circle|poly|default)">



<!ENTITY % Coords "CDATA">

    <!-- comma separated list of lengths -->



<!-- used for object, applet, img, input and iframe -->

<!ENTITY % ImgAlign "(top|middle|bottom|left|right)">



<!-- a color using sRGB: #RRGGBB as Hex values -->

<!ENTITY % Color "CDATA">



<!-- There are also 16 widely known color names with their sRGB values:



    Black  = #000000    Green  = #008000

    Silver = #C0C0C0    Lime   = #00FF00

    Gray   = #808080    Olive  = #808000

    White  = #FFFFFF    Yellow = #FFFF00

    Maroon = #800000    Navy   = #000080

    Red    = #FF0000    Blue   = #0000FF

    Purple = #800080    Teal   = #008080

    Fuchsia= #FF00FF    Aqua   = #00FFFF

-->



<!--=================== Generic Attributes ===============================-->



<!-- core attributes common to most elements

  id       document-wide unique id

  class    space separated list of classes

  style    associated style info

  title    advisory title/amplification

-->

<!ENTITY % coreattrs

 "id          ID             #IMPLIED

  class       CDATA          #IMPLIED

  style       %StyleSheet;   #IMPLIED

  title       %Text;         #IMPLIED"

  >



<!-- internationalization attributes

  lang        language code (backwards compatible)

  xml:lang    language code (as per XML 1.0 spec)

  dir         direction for weak/neutral text

-->

<!ENTITY % i18n

 "lang        %LanguageCode; #IMPLIED

  xml:lang    %LanguageCode; #IMPLIED

  dir         (ltr|rtl)      #IMPLIED"

  >



<!-- attributes for common UI events

  onclick     a pointer button was clicked

  ondblclick  a pointer button was double clicked

  onmousedown a pointer button was pressed down

  onmouseup   a pointer button was released

  onmousemove a pointer was moved onto the element

  onmouseout  a pointer was moved away from the element

  onkeypress  a key was pressed and released

  onkeydown   a key was pressed down

  onkeyup     a key was released

-->

<!ENTITY % events

 "onclick     %Script;       #IMPLIED

  ondblclick  %Script;       #IMPLIED

  onmousedown %Script;       #IMPLIED

  onmouseup   %Script;       #IMPLIED

  onmouseover %Script;       #IMPLIED

  onmousemove %Script;       #IMPLIED

  onmouseout  %Script;       #IMPLIED

  onkeypress  %Script;       #IMPLIED

  onkeydown   %Script;       #IMPLIED

  onkeyup     %Script;       #IMPLIED"

  >



<!-- attributes for elements that can get the focus

  accesskey   accessibility key character

  tabindex    position in tabbing order

  onfocus     the element got the focus

  onblur      the element lost the focus

-->

<!ENTITY % focus

 "accesskey   %Character;    #IMPLIED

  tabindex    %Number;       #IMPLIED

  onfocus     %Script;       #IMPLIED

  onblur      %Script;       #IMPLIED"

  >



<!ENTITY % attrs "%coreattrs; %i18n; %events;">



<!-- text alignment for p, div, h1-h6. The default is

     align="left" for ltr headings, "right" for rtl -->



<!ENTITY % TextAlign "align (left|center|right|justify) #IMPLIED">



<!--=================== Text Elements ====================================-->



<!ENTITY % special.extra

   "object | applet | img | map | iframe">

    

<!ENTITY % special.basic

    "br | span | bdo">



<!ENTITY % special

   "%special.basic; | %special.extra;">



<!ENTITY % fontstyle.extra "big | small | font | basefont">



<!ENTITY % fontstyle.basic "tt | i | b | u

                      | s | strike ">



<!ENTITY % fontstyle "%fontstyle.basic; | %fontstyle.extra;">



<!ENTITY % phrase.extra "sub | sup">

<!ENTITY % phrase.basic "em | strong | dfn | code | q |

                   samp | kbd | var | cite | abbr | acronym">



<!ENTITY % phrase "%phrase.basic; | %phrase.extra;">



<!ENTITY % inline.forms "input | select | textarea | label | button">



<!-- these can occur at block or inline level -->

<!ENTITY % misc.inline "ins | del | script">



<!-- these can only occur at block level -->

<!ENTITY % misc "noscript | %misc.inline;">



<!ENTITY % inline "a | %special; | %fontstyle; | %phrase; | %inline.forms;">



<!-- %Inline; covers inline or "text-level" elements -->

<!ENTITY % Inline "(#PCDATA | %inline; | %misc.inline;)*">



<!--================== Block level elements ==============================-->



<!ENTITY % heading "h1|h2|h3|h4|h5|h6">

<!ENTITY % lists "ul | ol | dl | menu | dir">

<!ENTITY % blocktext "pre | hr | blockquote | address | center | noframes">



<!ENTITY % block

    "p | %heading; | div | %lists; | %blocktext; | isindex |fieldset | table">



<!-- %Flow; mixes block and inline and is used for list items etc. -->

<!ENTITY % Flow "(#PCDATA | %block; | form | %inline; | %misc;)*">



<!--================== Content models for exclusions =====================-->



<!-- a elements use %Inline; excluding a -->



<!ENTITY % a.content

   "(#PCDATA | %special; | %fontstyle; | %phrase; | %inline.forms; | %misc.inline;)*">



<!-- pre uses %Inline excluding img, object, applet, big, small,

     font, or basefont -->



<!ENTITY % pre.content

   "(#PCDATA | a | %special.basic; | %fontstyle.basic; | %phrase.basic; |

       %inline.forms; | %misc.inline;)*">



<!-- form uses %Flow; excluding form -->



<!ENTITY % form.content "(#PCDATA | %block; | %inline; | %misc;)*">



<!-- button uses %Flow; but excludes a, form, form controls, iframe -->



<!ENTITY % button.content

   "(#PCDATA | p | %heading; | div | %lists; | %blocktext; |

      table | br | span | bdo | object | applet | img | map |

      %fontstyle; | %phrase; | %misc;)*">



<!--================ Document Structure ==================================-->



<!-- the namespace URI designates the document profile -->



<!ELEMENT html (head, body)>

<!ATTLIST html

  %i18n;

  id          ID             #IMPLIED

  xmlns       %URI;          #FIXED 'http://www.w3.org/1999/xhtml'

  >



<!--================ Document Head =======================================-->



<!ENTITY % head.misc "(script|style|meta|link|object|isindex)*">



<!-- content model is %head.misc; combined with a single

     title and an optional base element in any order -->



<!ELEMENT head (%head.misc;,

     ((title, %head.misc;, (base, %head.misc;)?) |

      (base, %head.misc;, (title, %head.misc;))))>



<!ATTLIST head

  %i18n;

  id          ID             #IMPLIED

  profile     %URI;          #IMPLIED

  >



<!-- The title element is not considered part of the flow of text.

       It should be displayed, for example as the page header or

       window title. Exactly one title is required per document.

    -->

<!ELEMENT title (#PCDATA)>

<!ATTLIST title 

  %i18n;

  id          ID             #IMPLIED

  >



<!-- document base URI -->



<!ELEMENT base EMPTY>

<!ATTLIST base

  id          ID             #IMPLIED

  href        %URI;          #IMPLIED

  target      %FrameTarget;  #IMPLIED

  >



<!-- generic metainformation -->

<!ELEMENT meta EMPTY>

<!ATTLIST meta

  %i18n;

  id          ID             #IMPLIED

  http-equiv  CDATA          #IMPLIED

  name        CDATA          #IMPLIED

  content     CDATA          #REQUIRED

  scheme      CDATA          #IMPLIED

  >



<!--

  Relationship values can be used in principle:



   a) for document specific toolbars/menus when used

      with the link element in document head e.g.

        start, contents, previous, next, index, end, help

   b) to link to a separate style sheet (rel="stylesheet")

   c) to make a link to a script (rel="script")

   d) by stylesheets to control how collections of

      html nodes are rendered into printed documents

   e) to make a link to a printable version of this document

      e.g. a PostScript or PDF version (rel="alternate" media="print")

-->



<!ELEMENT link EMPTY>

<!ATTLIST link

  %attrs;

  charset     %Charset;      #IMPLIED

  href        %URI;          #IMPLIED

  hreflang    %LanguageCode; #IMPLIED

  type        %ContentType;  #IMPLIED

  rel         %LinkTypes;    #IMPLIED

  rev         %LinkTypes;    #IMPLIED

  media       %MediaDesc;    #IMPLIED

  target      %FrameTarget;  #IMPLIED

  >



<!-- style info, which may include CDATA sections -->

<!ELEMENT style (#PCDATA)>

<!ATTLIST style

  %i18n;

  id          ID             #IMPLIED

  type        %ContentType;  #REQUIRED

  media       %MediaDesc;    #IMPLIED

  title       %Text;         #IMPLIED

  xml:space   (preserve)     #FIXED 'preserve'

  >



<!-- script statements, which may include CDATA sections -->

<!ELEMENT script (#PCDATA)>

<!ATTLIST script

  id          ID             #IMPLIED

  charset     %Charset;      #IMPLIED

  type        %ContentType;  #REQUIRED

  language    CDATA          #IMPLIED

  src         %URI;          #IMPLIED

  defer       (defer)        #IMPLIED

  xml:space   (preserve)     #FIXED 'preserve'

  >



<!-- alternate content container for non script-based rendering -->



<!ELEMENT noscript %Flow;>

<!ATTLIST noscript

  %attrs;

  >



<!--======================= Frames =======================================-->



<!-- inline subwindow -->



<!ELEMENT iframe %Flow;>

<!ATTLIST iframe

  %coreattrs;

  longdesc    %URI;          #IMPLIED

  name        NMTOKEN        #IMPLIED

  src         %URI;          #IMPLIED

  frameborder (1|0)          "1"

  marginwidth %Pixels;       #IMPLIED

  marginheight %Pixels;      #IMPLIED

  scrolling   (yes|no|auto)  "auto"

  align       %ImgAlign;     #IMPLIED

  height      %Length;       #IMPLIED

  width       %Length;       #IMPLIED

  >



<!-- alternate content container for non frame-based rendering -->



<!ELEMENT noframes %Flow;>

<!ATTLIST noframes

  %attrs;

  >



<!--=================== Document Body ====================================-->



<!ELEMENT body %Flow;>

<!ATTLIST body

  %attrs;

  onload      %Script;       #IMPLIED

  onunload    %Script;       #IMPLIED

  background  %URI;          #IMPLIED

  bgcolor     %Color;        #IMPLIED

  text        %Color;        #IMPLIED

  link        %Color;        #IMPLIED

  vlink       %Color;        #IMPLIED

  alink       %Color;        #IMPLIED

  >



<!ELEMENT div %Flow;>  <!-- generic language/style container -->

<!ATTLIST div

  %attrs;

  %TextAlign;

  >



<!--=================== Paragraphs =======================================-->



<!ELEMENT p %Inline;>

<!ATTLIST p

  %attrs;

  %TextAlign;

  >



<!--=================== Headings =========================================-->



<!--

  There are six levels of headings from h1 (the most important)

  to h6 (the least important).

-->



<!ELEMENT h1  %Inline;>

<!ATTLIST h1

  %attrs;

  %TextAlign;

  >



<!ELEMENT h2 %Inline;>

<!ATTLIST h2

  %attrs;

  %TextAlign;

  >



<!ELEMENT h3 %Inline;>

<!ATTLIST h3

  %attrs;

  %TextAlign;

  >



<!ELEMENT h4 %Inline;>

<!ATTLIST h4

  %attrs;

  %TextAlign;

  >



<!ELEMENT h5 %Inline;>

<!ATTLIST h5

  %attrs;

  %TextAlign;

  >



<!ELEMENT h6 %Inline;>

<!ATTLIST h6

  %attrs;

  %TextAlign;

  >



<!--=================== Lists ============================================-->



<!-- Unordered list bullet styles -->



<!ENTITY % ULStyle "(disc|square|circle)">



<!-- Unordered list -->



<!ELEMENT ul (li)+>

<!ATTLIST ul

  %attrs;

  type        %ULStyle;     #IMPLIED

  compact     (compact)     #IMPLIED

  >



<!-- Ordered list numbering style



    1   arabic numbers      1, 2, 3, ...

    a   lower alpha         a, b, c, ...

    A   upper alpha         A, B, C, ...

    i   lower roman         i, ii, iii, ...

    I   upper roman         I, II, III, ...



    The style is applied to the sequence number which by default

    is reset to 1 for the first list item in an ordered list.

-->

<!ENTITY % OLStyle "CDATA">



<!-- Ordered (numbered) list -->



<!ELEMENT ol (li)+>

<!ATTLIST ol

  %attrs;

  type        %OLStyle;      #IMPLIED

  compact     (compact)      #IMPLIED

  start       %Number;       #IMPLIED

  >



<!-- single column list (DEPRECATED) --> 

<!ELEMENT menu (li)+>

<!ATTLIST menu

  %attrs;

  compact     (compact)     #IMPLIED

  >



<!-- multiple column list (DEPRECATED) --> 

<!ELEMENT dir (li)+>

<!ATTLIST dir

  %attrs;

  compact     (compact)     #IMPLIED

  >



<!-- LIStyle is constrained to: "(%ULStyle;|%OLStyle;)" -->

<!ENTITY % LIStyle "CDATA">



<!-- list item -->



<!ELEMENT li %Flow;>

<!ATTLIST li

  %attrs;

  type        %LIStyle;      #IMPLIED

  value       %Number;       #IMPLIED

  >



<!-- definition lists - dt for term, dd for its definition -->



<!ELEMENT dl (dt|dd)+>

<!ATTLIST dl

  %attrs;

  compact     (compact)      #IMPLIED

  >



<!ELEMENT dt %Inline;>

<!ATTLIST dt

  %attrs;

  >



<!ELEMENT dd %Flow;>

<!ATTLIST dd

  %attrs;

  >



<!--=================== Address ==========================================-->



<!-- information on author -->



<!ELEMENT address (#PCDATA | %inline; | %misc.inline; | p)*>

<!ATTLIST address

  %attrs;

  >



<!--=================== Horizontal Rule ==================================-->



<!ELEMENT hr EMPTY>

<!ATTLIST hr

  %attrs;

  align       (left|center|right) #IMPLIED

  noshade     (noshade)      #IMPLIED

  size        %Pixels;       #IMPLIED

  width       %Length;       #IMPLIED

  >



<!--=================== Preformatted Text ================================-->



<!-- content is %Inline; excluding 

        "img|object|applet|big|small|sub|sup|font|basefont" -->



<!ELEMENT pre %pre.content;>

<!ATTLIST pre

  %attrs;

  width       %Number;      #IMPLIED

  xml:space   (preserve)    #FIXED 'preserve'

  >



<!--=================== Block-like Quotes ================================-->



<!ELEMENT blockquote %Flow;>

<!ATTLIST blockquote

  %attrs;

  cite        %URI;          #IMPLIED

  >



<!--=================== Text alignment ===================================-->



<!-- center content -->

<!ELEMENT center %Flow;>

<!ATTLIST center

  %attrs;

  >



<!--=================== Inserted/Deleted Text ============================-->



<!--

  ins/del are allowed in block and inline content, but its

  inappropriate to include block content within an ins element

  occurring in inline content.

-->