文書プロファイルは、そのプロファイルに準拠した文書の許容文法を規定するスキーマを定義する。 この仕様書は、文書スキーマを定義するために XML 1.0 DTD を使うが、W3Cから出される将来の仕様書は、W3C XMLスキーマ言語が標準化されるにつれ、そちらを使うことになりそうである。
この仕様書は、第5節で定義されている3つの名前空間に対応する3つのDTDを定義する。 DTDは、異なるDTDによって共有されている多数のファイルに分解されている。 DTDコンポーネントにモジュールの構造を反映させるべく努力がなされている。 残念ながら、あらゆる場合で1対1の結び付けが可能であるとは限らない。 たとえば、基礎モジュールは2つのDTDコンポーネントに対応する。 1つのファイルがデータ型と内容モデルとを定義し、もう1つのファイルが要素や属性を定義するのである。
XMLリンク属性は、現行の XLink 仕様書草稿を用いた実験のためにその要素上に組み込まれている。 その他の要素については現時点では解決できない未解決問題があるが、今後の文書において処理されるであろう。
Voyager DTD のファイルのフルセットは、zip 圧縮されたアーカイブファイルで、この散文体の仕様書とともにダウンロードできる。
こちらにあるのは、HTML 4.0 strict 用 Voyager プロファイルのDTDである。 これには、コア機能に加えて、マルチメディア、フォーム、テーブルがある。 %extra.block; 実体や &extra.inline; 実体は、それぞれブロック要素やインライン要素のセットの中に新しい要素を追加するために使われている。 %media; 実体は、object や img, map といったメディア要素を追加するが、audio や video といった新しい要素を組み込むために拡張することができる。
XML DTDは、あまりSGMLほども柔軟ではなく、結果として HTML 4.0 との相違点が多数ある。 title 要素や base 要素は、文書ヘッダの中にあるその他の内容の前に置かれなければならない。 inclusion や exclusions がないので、ハイパーテキストリンク(<a> 要素)はネストできないといったような制約を表現することが面倒になっている。 これらの制約は注釈の中に注記される。
<!--
Voyager version of HTML 4.0 Strict DTD
Namespace = http://www.w3.org/Profiles/voyager-strict
Copyright (c) 1998 W3C (MIT, INRIA, Keio),
All Rights Reserved.
-->
<!-- Name files we will want to include -->
<!ENTITY % Voyager.entities SYSTEM "html-entities.mod">
<!ENTITY % Voyager.chars SYSTEM "html-chars.mod">
<!ENTITY % Voyager.base SYSTEM "html-base.mod">
<!ENTITY % Voyager.phrases SYSTEM "html-phrases.mod">
<!ENTITY % Voyager.lists SYSTEM "html-lists.mod">
<!ENTITY % Voyager.blocktext SYSTEM "html-blocktext.mod">
<!ENTITY % Voyager.object SYSTEM "html-object.mod">
<!ENTITY % Voyager.img SYSTEM "html-img.mod">
<!ENTITY % Voyager.forms SYSTEM "html-forms.mod">
<!ENTITY % Voyager.tables SYSTEM "html-tables.mod">
<!-- Customize entities that control the content model -->
<!ENTITY % block.forms "form | fieldset">
<!ENTITY % media "|object | img | map">
<!ENTITY % fontstyle "tt | i | b | big | small">
<!ENTITY % phrase "em | strong | dfn | code | q | sub | sup |
samp | kbd | var | cite | abbr | acronym" >
<!ENTITY % lists "ul | ol | dl">
<!ENTITY % inline.forms "input | select | label | textarea | button">
<!ENTITY % blocktext "pre | hr | blockquote | address">
<!ENTITY % extra.block "| %lists; | %blocktext; | %block.forms; | table">
<!ENTITY % extra.inline "| %fontstyle; | %phrase; | %inline.forms;">
<!--
Now import the files using the names we declared
earlier, starting with the entities file and ending
with the base file. The entities file defines the
standard content models for elements declared in the
following files.
-->
%Voyager.entities;
%Voyager.chars;
%Voyager.phrases;
%Voyager.lists;
%Voyager.blocktext;
%Voyager.object;
%Voyager.img;
%Voyager.forms;
%Voyager.tables;
%Voyager.base;
こちらにあるのは、HTML 4.0 transitional 用 Voyager プロファイルのDTDである。 これは表現的属性や、basefont, font, center, applet, noframes という要素を追加している。
<!--
Voyager version of HTML 4.0 Transitional DTD
Namespace = http://www.w3.org/Profiles/voyager-loose
Copyright (c) 1998 W3C (MIT, INRIA, Keio),
All Rights Reserved.
-->
<!-- Name files we will want to include -->
<!ENTITY % Voyager.entities SYSTEM "html-entities.mod">
<!ENTITY % Voyager.chars SYSTEM "html-chars.mod">
<!ENTITY % Voyager.base SYSTEM "html-base.mod">
<!ENTITY % Voyager.loose SYSTEM "html-loose.mod">
<!ENTITY % Voyager.phrases SYSTEM "html-phrases.mod">
<!ENTITY % Voyager.lists SYSTEM "html-lists.mod">
<!ENTITY % Voyager.blocktext SYSTEM "html-blocktext.mod">
<!ENTITY % Voyager.object SYSTEM "html-object.mod">
<!ENTITY % Voyager.img SYSTEM "html-img.mod">
<!ENTITY % Voyager.applet SYSTEM "html-applet.mod">
<!ENTITY % Voyager.forms SYSTEM "html-forms.mod">
<!ENTITY % Voyager.tables SYSTEM "html-tables.mod">
<!-- Customize entities that control the content model -->
<!ENTITY % block.forms "form | fieldset">
<!ENTITY % media "|object | applet | img | map">
<!ENTITY % fontstyle "tt | i | b | big | small | u | s">
<!ENTITY % phrase "em | strong | dfn | code | q | sub | sup |
samp | kbd | var | cite | abbr | acronym" >
<!ENTITY % lists "ul | ol | dl">
<!ENTITY % inline.forms "input | select | label | textarea | button">
<!ENTITY % blocktext "pre | hr | blockquote | address">
<!ENTITY % extra.block "| %lists; | %blocktext; | %block.forms;
| table | center | noframes">
<!ENTITY % extra.inline "| %fontstyle; | %phrase; | %inline.forms;
| basefont | font">
<!--
Now import the files using the names we declared
earlier, starting with the entities file and ending
with the base file. The entities file defines the
standard content models for elements declared in the
following files.
-->
%Voyager.entities;
%Voyager.chars;
%Voyager.loose;
%Voyager.phrases;
%Voyager.lists;
%Voyager.blocktext;
%Voyager.object;
%Voyager.applet;
%Voyager.img;
%Voyager.forms;
%Voyager.tables;
%Voyager.base;
こちらにあるのは、フレームセット文書用 Voyager プロファイルのDTDである。 %html.content; 実体は、HTML要素がフレームセットを本文と交換できるよう内容モデルを定義し直すために使われる。
<!--
Voyager version of HTML 4.0 Frameset DTD
Namespace = http://www.w3.org/Profiles/voyager-frameset
Copyright (c) 1998 W3C (MIT, INRIA, Keio),
All Rights Reserved.
-->
<!-- Name files we will want to include -->
<!ENTITY % Voyager.entities SYSTEM "html-entities.mod">
<!ENTITY % Voyager.chars SYSTEM "html-chars.mod">
<!ENTITY % Voyager.base SYSTEM "html-base.mod">
<!ENTITY % Voyager.loose SYSTEM "html-loose.mod">
<!ENTITY % Voyager.frames SYSTEM "html-frames.mod">
<!ENTITY % Voyager.phrases SYSTEM "html-phrases.mod">
<!ENTITY % Voyager.lists SYSTEM "html-lists.mod">
<!ENTITY % Voyager.blocktext SYSTEM "html-blocktext.mod">
<!ENTITY % Voyager.object SYSTEM "html-object.mod">
<!ENTITY % Voyager.img SYSTEM "html-img.mod">
<!ENTITY % Voyager.applet SYSTEM "html-applet.mod">
<!ENTITY % Voyager.forms SYSTEM "html-forms.mod">
<!ENTITY % Voyager.tables SYSTEM "html-tables.mod">
<!-- Customize entities that control the content model -->
<!ENTITY % block.forms "form | fieldset">
<!ENTITY % media "|object | applet| img | map">
<!ENTITY % fontstyle "tt | i | b | big | small | u | s">
<!ENTITY % phrase "em | strong | dfn | code | q | sub | sup |
samp | kbd | var | cite | abbr | acronym" >
<!ENTITY % lists "ul | ol | dl">
<!ENTITY % inline.forms "input | select | label | textarea | button">
<!ENTITY % blocktext "pre | hr | blockquote | address">
<!ENTITY % html.content "head, frameset">
<!ENTITY % noframes.content "(body)">
<!ENTITY % extra.block "| %lists; | %blocktext; | %block.forms;
| table | center | noframes">
<!ENTITY % extra.inline "| %fontstyle; | %phrase; | %inline.forms;
| basefont | font">
<!--
Now import the files using the names we declared
earlier, starting with the entities file and ending
with the base module. The entities file defines the
standard content models for elements declared in the
following files.
-->
%Voyager.entities;
%Voyager.chars;
%Voyager.loose;
%Voyager.frames;
%Voyager.phrases;
%Voyager.lists;
%Voyager.blocktext;
%Voyager.object;
%Voyager.applet;
%Voyager.img;
%Voyager.forms;
%Voyager.tables;
%Voyager.base;
<!--
This is the entities DTD for Voyager. It is derived from
the HTML 4.0 strict DTD with a few changes to make it simple
to formalize as XML. It should be included before any element
declarations as it defines entities for the content models used
by most elements in Voyager.
Copyright (c) 1998 W3C (MIT, INRIA, Keio), All Rights Reserved.
Author: Dave Raggett <dsr@w3.org>
Date: 17th November 1998
-->
<!--================== 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 "CDATA">
<!-- a language code, as per [RFC1766] -->
<!ENTITY % Character "CDATA">
<!-- a single character from [ISO10646] -->
<!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 [RFC1808] and [RFC1738] -->
<!ENTITY % Datetime "CDATA"> <!-- date and time information. ISO date format -->
<!ENTITY % Script "CDATA"> <!-- script expression -->
<!ENTITY % StyleSheet "CDATA"> <!-- style sheet data -->
<!ENTITY % Text "CDATA"> <!-- render in this frame -->
<!ENTITY % FrameTarget "CDATA"> <!-- render in this frame -->
<!ENTITY % Length "CDATA"> <!-- nn for pixels or nn% for percentage length -->
<!ENTITY % MultiLength "CDATA"> <!-- pixel, percentage, or relative -->
<!ENTITY % MultiLengths "CDATA"> <!-- comma-separated list of MultiLength -->
<!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 -->
<!--=================== Generic Attributes ===============================-->
<!ENTITY % extra-attrs ""> <!-- for extensions -->
<!-- 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; %extra-attrs;">
<!--=================== Text Elements =====================================-->
<!-- use %extra.inline; to add new inline elements -->
<!ENTITY % extra.inline "">
<!ENTITY % media ""> <!-- override this to add media elements -->
<!ENTITY % special
"a | br | span | bdo %media;">
<!-- these can occur at block or inline level -->
<!ENTITY % misc "ins | del | script | noscript">
<!-- core definition excludes fontstyle/phrase -->
<!ENTITY % inline "%special; %extra.inline;">
<!-- %Inline; covers inline or "text-level" elements -->
<!ENTITY % Inline "(#PCDATA | %inline; | %misc;)*">
<!--================== Block level elements ==============================-->
<!ENTITY % heading "h1|h2|h3|h4|h5|h6">
<!ENTITY % extra.block ""> <!-- for additions to block elements -->
<!ENTITY % block
"p | %heading; | div %extra.block;">
<!ENTITY % Block "(#PCDATA | %block; | %misc;)*">
<!-- %Flow; mixes Block and Inline and is used for list items etc. -->
<!ENTITY % Flow "(#PCDATA | %block; | %inline; | %misc;)*">
<!--================== HTML content models ===============================-->
<!--
HTML has two basic content models:
%Inline; character level elements and text strings
%Block; block-like elements e.g. paragraphs and lists
-->
<!-- this is used to adjust the content model for the html element -->
<!ENTITY % html.content "head, body">
<!--
This is the character entities DTD for Voyager. It is
derived from the HTML 4.0 strict DTD with a few changes
to make it simple to formalize as XML.
Copyright (c) 1998 W3C (MIT, INRIA, Keio), All Rights Reserved.
Author: Dave Raggett <dsr@w3.org>
Date: 17th November 1998
-->
<!--================ Character mnemonic entities =========================-->
<!ENTITY % HTMLlat1 PUBLIC
"-//W3C//ENTITIES Latin1//EN//HTML"
"HTMLlat1.ent">
%HTMLlat1x;
<!ENTITY % HTMLsymbol PUBLIC
"-//W3C//ENTITIES Symbols//EN//HTML"
"HTMLsymbol.ent">
%HTMLsymbolx;
<!ENTITY % HTMLspecial PUBLIC
"-//W3C//ENTITIES Special//EN//HTML"
"HTMLspecial.ent">
%HTMLspecialx;
<!--
Common presentation entity and element declarations
for Voyager. This should be imported before element
declarations.
Copyright (c) 1998 W3C (MIT, INRIA, Keio), All Rights Reserved.
Author: Dave Raggett <dsr@w3.org>
-->
<!-- 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
-->
<!ENTITY % body.extra "
background %URI; #IMPLIED
bgcolor %Color; #IMPLIED
text %Color; #IMPLIED
link %Color; #IMPLIED
vlink %Color; #IMPLIED
alink %Color; #IMPLIED
">
<!ENTITY % body.content "%Flow;">
<!ENTITY % noscript.content "%Flow;">
<!ENTITY % br.extra "
clear (left|all|right|none) 'none'
">
<!ENTITY % IAlign "(top|middle|bottom|left|right)">
<!ENTITY % img.extra "
align %IAlign; #IMPLIED
border %Length; #IMPLIED
hspace %Pixels; #IMPLIED
vspace %Pixels; #IMPLIED
">
<!ENTITY % object.extra "
align %IAlign; #IMPLIED
border %Length; #IMPLIED
hspace %Pixels; #IMPLIED
vspace %Pixels; #IMPLIED
">
<!ENTITY % hr.extra "
align (left|center|right) #IMPLIED
noshade (noshade) #IMPLIED
size %Pixels; #IMPLIED
width %Length; #IMPLIED
">
<!-- default is left for ltr paragraphs, right for rtl -->
<!ENTITY % p.extra "
align (left|center|right) #IMPLIED
">
<!-- default is left for ltr headings, right for rtl -->
<!ENTITY % headings.extra "
align (left|center|right) #IMPLIED
">
<!ENTITY % pre.extra "
width %Number; #IMPLIED
">
<!-- Unordered Lists (UL) bullet styles -->
<!ENTITY % ULStyle "(disc|square|circle)">
<!ENTITY % ul.extra "
type %ULStyle; #IMPLIED
compact (compact) #IMPLIED
">
<!-- Ordered lists (OL) Numbering style
1 arablic 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">
<!ENTITY % ol.extra "
type %OLStyle; #IMPLIED
compact (compact) #IMPLIED
start %Number; #IMPLIED
">
<!ENTITY % dl.extra "
compact (compact) #IMPLIED
">
<!-- LIStyle is constrained to: "(%ULStyle;|%OLStyle;)" -->
<!ENTITY % LIStyle "CDATA">
<!ENTITY % li.extra "
type %LIStyle; #IMPLIED
value %Number; #IMPLIED
">
<!ENTITY % CAlign "(top|bottom|left|right)">
<!ENTITY % caption.extra "
align %CAlign; #IMPLIED
">
<!ENTITY % base.extra "
target %FrameTarget; #IMPLIED
">
<!ENTITY % a.extra "
target %FrameTarget; #IMPLIED
">
<!ENTITY % area.extra "
target %FrameTarget; #IMPLIED
">
<!ENTITY % form.extra "
target %FrameTarget; #IMPLIED
">
<!ENTITY % input.extra "
align %IAlign; #IMPLIED
">
<!ENTITY % LAlign "(top|bottom|left|right)">
<!ENTITY % legend.extra "
align %LAlign; #IMPLIED
">
<!-- underline -->
<!ELEMENT u %Inline;>
<!ATTLIST u %attrs;>
<!-- strike-through -->
<!ELEMENT s %Inline;>
<!ATTLIST s %attrs;>
<!-- base font size -->
<!ELEMENT basefont EMPTY>
<!ATTLIST basefont
id ID #IMPLIED
size CDATA #REQUIRED
color %Color; #IMPLIED
face CDATA #IMPLIED
>
<!-- local change to font -->
<!ELEMENT font %Inline;>
<!ATTLIST font
%coreattrs;
%i18n;
size CDATA #IMPLIED
color %Color; #IMPLIED
face CDATA #IMPLIED
>
<!-- center content -->
<!ELEMENT center %Flow;>
<!ATTLIST center
%coreattrs;
%i18n;
>
<!-- redefined for frameset docs -->
<!ENTITY % noframes.content "%Flow;">
<!-- alternate content container for non frame-based rendering -->
<!ELEMENT noframes %noframes.content;>
<!ATTLIST noframes
%attrs;
>
<!--
Font style and phrase markup, exluding span bdo and br which
are defined in the base DTD. This is part of the Voyager
suite of DTDs.
Copyright (c) 1998 W3C (MIT, INRIA, Keio), All Rights Reserved.
Author: Dave Raggett <dsr@w3.org>
-->
<!--===================== Inline Elements ================================-->
<!-- excludes span, bdo and br which are defined in the base module -->
<!ELEMENT em %Inline;> <!-- emphasis -->
<!ATTLIST em %attrs;>
<!ELEMENT strong %Inline;> <!-- strong emphasis -->
<!ATTLIST strong %attrs;>
<!ELEMENT dfn %Inline;> <!-- definitional -->
<!ATTLIST dfn %attrs;>
<!ELEMENT code %Inline;> <!-- program code -->
<!ATTLIST code %attrs;>
<!ELEMENT samp %Inline;> <!-- sample -->
<!ATTLIST samp %attrs;>
<!ELEMENT kbd %Inline;> <!-- something user would type -->
<!ATTLIST kbd %attrs;>
<!ELEMENT var %Inline;> <!-- variable -->
<!ATTLIST var %attrs;>
<!ELEMENT cite %Inline;> <!-- citation -->
<!ATTLIST cite %attrs;>
<!ELEMENT abbr %Inline;> <!-- abbreviation -->
<!ATTLIST abbr %attrs;>
<!ELEMENT acronym %Inline;> <!-- acronym -->
<!ATTLIST acronym %attrs;>
<!ELEMENT q %Inline;> <!-- inlined quote -->
<!ATTLIST q
%attrs;
cite %URI; #IMPLIED
>
<!ELEMENT sub %Inline;> <!-- subscript -->
<!ATTLIST sub %attrs;>
<!ELEMENT sup %Inline;> <!-- superscript -->
<!ATTLIST sup %attrs;>
<!ELEMENT tt %Inline;> <!-- fixed pitch font -->
<!ATTLIST tt %attrs;>
<!ELEMENT i %Inline;> <!-- italic font -->
<!ATTLIST i %attrs;>
<!ELEMENT b %Inline;> <!-- bold font -->
<!ATTLIST b %attrs;>
<!ELEMENT big %Inline;> <!-- bigger font -->
<!ATTLIST big %attrs;>
<!ELEMENT small %Inline;> <!-- smaller font -->
<!ATTLIST small %attrs;>
<!-- This DTD defines miscellaneous block level elements for Voyager. Defines address, hr, pre, and blockquote elements Copyright (c) 1998 W3C (MIT, INRIA, Keio), All Rights Reserved. Author: Dave Raggett <dsr@w3.org> --> <!--=================== Address ==========================================--> <!ELEMENT address %Inline;> <!-- information on author --> <!ATTLIST address %attrs; > <!--=================== Horizontal Rule ==================================--> <!ENTITY % hr.extra ""> <!ELEMENT hr EMPTY> <!ATTLIST hr %coreattrs; %events; %hr.extra; > <!--=================== Preformatted Text ================================--> <!ENTITY % pre.extra ""> <!ELEMENT pre %Inline;> <!ATTLIST pre %attrs; %pre.extra; xml:space CDATA #FIXED "preserve" > <!--=================== Block-like Quotes ================================--> <!ELEMENT blockquote %Block;> <!ATTLIST blockquote %attrs; cite %URI; #IMPLIED >
<!-- This is the list DTD for Voyager. Defines ul, ol, li, dl, dt and dd elements. Copyright (c) 1998 W3C (MIT, INRIA, Keio), All Rights Reserved. Author: Dave Raggett <dsr@w3.org> --> <!--=================== Lists ============================================--> <!-- Unordered Lists (UL) bullet styles --> <!ENTITY % ul.extra ""> <!ELEMENT ul (li)+> <!ATTLIST ul %attrs; %ul.extra; > <!-- ordered (numbered) list --> <!ENTITY % ol.extra ""> <!ELEMENT ol (li)+> <!ATTLIST ol %attrs; %ol.extra; > <!-- list item --> <!ENTITY % li.extra ""> <!ELEMENT li %Flow;> <!ATTLIST li %attrs; %li.extra; > <!-- definition lists - DT for term, DD for its definition --> <!ENTITY % dl.extra ""> <!ELEMENT dl (dt|dd)+> <!ATTLIST dl %attrs; %dl.extra; > <!ELEMENT dt %Inline;> <!ATTLIST dt %attrs; > <!ELEMENT dd %Flow;> <!ATTLIST dd %attrs; >
<!--
Forms DTD for Voyager. This is expected to be
supplanted by a new forms module providing an improved
match to database and workflow applications.
Copyright (c) 1998 W3C (MIT, INRIA, Keio), All Rights Reserved.
Author: Dave Raggett <dsr@w3.org>
-->
<!--================ Forms ===============================================-->
<!ELEMENT form %Block;> <!-- forms shouldn't be nested -->
<!ENTITY % form.extra "">
<!ATTLIST form
%attrs;
action %URI; #REQUIRED
method (get|post) "get"
enctype %ContentType; "application/x-www-form-urlencoded"
onsubmit %Script; #IMPLIED
onreset %Script; #IMPLIED
accept-charset %Charsets; #IMPLIED
%form.extra;
>
<!--
Each label must not contain more than ONE field
Label elements shouldn't be nested.
-->
<!ELEMENT label %Inline;>
<!ATTLIST label
%attrs;
for IDREF #IMPLIED
accesskey %Character; #IMPLIED
onfocus %Script; #IMPLIED
onblur %Script; #IMPLIED
>
<!ENTITY % InputType
"(text | password | checkbox |
radio | submit | reset |
file | hidden | image | button)"
>
<!-- attribute name required for all but submit & reset -->
<!ENTITY % input.extra "">
<!ELEMENT input EMPTY> <!-- form control -->
<!ATTLIST input
%attrs;
type %InputType; "text"
name CDATA #IMPLIED
value CDATA #IMPLIED
checked (checked) #IMPLIED
disabled (disabled) #IMPLIED
readonly (readonly) #IMPLIED
size CDATA #IMPLIED
maxlength %Number; #IMPLIED
src %URI; #IMPLIED
alt CDATA #IMPLIED
usemap %URI; #IMPLIED
tabindex %Number; #IMPLIED
accesskey %Character; #IMPLIED
onfocus %Script; #IMPLIED
onblur %Script; #IMPLIED
onselect %Script; #IMPLIED
onchange %Script; #IMPLIED
accept %ContentTypes; #IMPLIED
%input.extra;
>
<!ELEMENT select (optgroup|option)+> <!-- option selector -->
<!ATTLIST select
%attrs;
name CDATA #IMPLIED
size %Number; #IMPLIED
multiple (multiple) #IMPLIED
disabled (disabled) #IMPLIED
tabindex %Number; #IMPLIED
onfocus %Script; #IMPLIED
onblur %Script; #IMPLIED
onchange %Script; #IMPLIED
>
<!ELEMENT optgroup (option)+> <!-- option group -->
<!ATTLIST optgroup
%attrs;
disabled (disabled) #IMPLIED
label %Text; #REQUIRED
>
<!ELEMENT option (#PCDATA)> <!-- selectable choice -->
<!ATTLIST option
%attrs;
selected (selected) #IMPLIED
disabled (disabled) #IMPLIED
label %Text; #IMPLIED
value CDATA #IMPLIED
>
<!ELEMENT textarea (#PCDATA)> <!-- multi-line text field -->
<!ATTLIST textarea
%attrs;
name CDATA #IMPLIED
rows %Number; #REQUIRED
cols %Number; #REQUIRED
disabled (disabled) #IMPLIED
readonly (readonly) #IMPLIED
tabindex %Number; #IMPLIED
accesskey %Character; #IMPLIED
onfocus %Script; #IMPLIED
onblur %Script; #IMPLIED
onselect %Script; #IMPLIED
onchange %Script; #IMPLIED
>
<!--
div is introduced here to enclose the contents of
the fieldset element to avoid mixed content problems
-->
<!ELEMENT fieldset (legend,div)> <!-- form control group -->
<!ATTLIST fieldset
%attrs;
>
<!ENTITY % legend.extra "">
<!ELEMENT legend %Inline;> <!-- fieldset label -->
<!ATTLIST legend
%attrs;
accesskey %Character; #IMPLIED
%legend.extra;
>
<!--
Buttons shouldn't include anchors, form controls, or form elements
-->
<!ELEMENT button %Flow;> <!-- push button -->
<!ATTLIST button
%attrs;
name CDATA #IMPLIED
value CDATA #IMPLIED
type (button|submit|reset) "submit"
disabled (disabled) #IMPLIED
tabindex %Number; #IMPLIED
accesskey %Character; #IMPLIED
onfocus %Script; #IMPLIED
onblur %Script; #IMPLIED
>
<!--
DTD for table elements for Voyager.
Copyright (c) 1998 W3C (MIT, INRIA, Keio), All Rights Reserved.
Author: Dave Raggett <dsr@w3.org>
Table tags present rendering problems for small displays
and voice browsers. As a result, W3C hopes to provide an
alternative tag set that makes the data model for tabular
data explicit, thereby making it easier to provide renderings
appropriate to device capabilities, e.g. as expanding lists.
-->
<!--======================= Tables =======================================-->
<!-- Derived from IETF HTML table standard, see [RFC1942] -->
<!--
The BORDER attribute sets the thickness of the frame around the
table. The default units are screen pixels.
The FRAME attribute specifies which parts of the frame around
the table should be rendered. The values are not the same as
CALS to avoid a name clash with the VALIGN attribute.
The value "border" is included for backwards compatibility with
<TABLE BORDER> which yields frame=border and border=implied
For <TABLE BORDER=1> you get border=1 and frame=implied. In this
case, it is appropriate to treat this as frame=border for backwards
compatibility with deployed browsers.
-->
<!ENTITY % TFrame "(void|above|below|hsides|lhs|rhs|vsides|box|border)">
<!--
The RULES attribute defines which rules to draw between cells:
If RULES is absent then assume:
"none" if BORDER is absent or BORDER=0 otherwise "all"
-->
<!ENTITY % TRules "(none | groups | rows | cols | all)">
<!-- horizontal placement of table relative to document -->
<!ENTITY % TAlign "(left|center|right)">
<!-- horizontal alignment attributes for cell contents
char alignment char, e.g. char=':'
charoff offset for alignment char
-->
<!ENTITY % cellhalign
"align (left|center|right|justify|char) #IMPLIED
char %Character; #IMPLIED
charoff %Length; #IMPLIED"
>
<!-- vertical alignment attributes for cell contents -->
<!ENTITY % cellvalign
"valign (top|middle|bottom|baseline) #IMPLIED"
>
<!ELEMENT table
(caption?, (col*|colgroup*), ((thead?, tfoot?, tbody+)|(tr+)))>
<!ELEMENT caption %Inline;>
<!ELEMENT thead (tr)+>
<!ELEMENT tfoot (tr)+>
<!ELEMENT tbody (tr)+>
<!ELEMENT colgroup (col)*>
<!ELEMENT col EMPTY>
<!ELEMENT tr (th|td)+>
<!ELEMENT th %Flow;>
<!ELEMENT td %Flow;>
<!ATTLIST table
%attrs;
summary %Text; #IMPLIED
width %Length; #IMPLIED
border CDATA #IMPLIED
frame %TFrame; #IMPLIED
rules %TRules; #IMPLIED
cellspacing %Length; #IMPLIED
cellpadding %Length; #IMPLIED
>
<!ENTITY % CAlign "(top|bottom|left|right)">
<!ENTITY % caption.extra "">
<!ATTLIST caption
%attrs;
%caption.extra;
>
<!--
COLGROUP groups a set of COL elements. It allows you to group
several semantically related columns together.
-->
<!ATTLIST colgroup
%attrs;
span %Number; "1"
width %MultiLength; #IMPLIED
%cellhalign;
%cellvalign;
>
<!--
COL elements define the alignment properties for cells in
one or more columns.
The WIDTH attribute specifies the width of the columns, e.g.
width=64 width in screen pixels
width=0.5* relative width of 0.5
The SPAN attribute causes the attributes of one
COL element to apply to more than one column.
-->
<!ATTLIST col
%attrs;
span %Number; "1"
width %MultiLength; #IMPLIED
%cellhalign;
%cellvalign;
>
<!--
Use THEAD to duplicate headers when breaking table
across page boundaries, or for static headers when
TBODY sections are rendered in scrolling panel.
Use TFOOT to duplicate footers when breaking table
across page boundaries, or for static footers when
TBODY sections are rendered in scrolling panel.
Use multiple TBODY sections when rules are needed
between groups of table rows.
-->
<!ATTLIST thead
%attrs;
%cellhalign;
%cellvalign;
>
<!ATTLIST tfoot
%attrs;
%cellhalign;
%cellvalign;
>
<!ATTLIST tbody
%attrs;
%cellhalign;
%cellvalign;
>
<!ATTLIST tr
%attrs;
%cellhalign;
%cellvalign;
>
<!-- Scope is simpler than axes attribute for common tables -->
<!ENTITY % Scope "(row|col|rowgroup|colgroup)">
<!-- TH is for headers, TD for data, but for cells acting as both use TD -->
<!ATTLIST th
%attrs;
abbr %Text; #IMPLIED
axis CDATA #IMPLIED
headers IDREFS #IMPLIED
scope %Scope; #IMPLIED
rowspan %Number; "1"
colspan %Number; "1"
%cellhalign;
%cellvalign;
>
<!ATTLIST td
%attrs;
abbr %Text; #IMPLIED
axis CDATA #IMPLIED
headers IDREFS #IMPLIED
scope %Scope; #IMPLIED
rowspan %Number; "1"
colspan %Number; "1"
%cellhalign;
%cellvalign;
>
<!--
This is the img DTD for Voyager.
Copyright (c) 1998 W3C (MIT, INRIA, Keio), All Rights Reserved.
Author: Dave Raggett <dsr@w3.org>
-->
<!--=================== Images ===========================================-->
<!--
To avoid accessibility problems for people who aren't
able to see the image, you should provide a text
description using the alt and longdesc attributes.
In addition avoid the use of server-side image maps.
-->
<!ENTITY % img.extra "">
<!ELEMENT img EMPTY>
<!ATTLIST img
%attrs;
src %URI; #REQUIRED
alt %Text; #REQUIRED
longdesc %URI; #IMPLIED
height %Length; #IMPLIED
width %Length; #IMPLIED
usemap %URI; #IMPLIED
ismap (ismap) #IMPLIED
author CDATA #IMPLIED
copyright CDATA #IMPLIED
%img.extra;
>
<!-- USEMAP points to a MAP element which may be in this document
or an external document, although the latter is not widely supported -->
<!--================== Client-side image maps ============================-->
<!-- These can be placed in the same document or grouped in a
separate document although this isn't yet widely supported -->
<!ELEMENT map ((%block; | %misc;)+ | area+)>
<!ATTLIST map
%attrs;
name CDATA #REQUIRED
>
<!ENTITY % area.extra "">
<!ELEMENT area EMPTY>
<!ATTLIST area
%attrs;
shape %Shape; "rect"
coords %Coords; #IMPLIED
href %URI; #IMPLIED
nohref (nohref) #IMPLIED
alt %Text; #REQUIRED
tabindex %Number; #IMPLIED
accesskey %Character; #IMPLIED
onfocus %Script; #IMPLIED
onblur %Script; #IMPLIED
%area.extra;
>
<!-- DTD for the object element for Voyager. Copyright (c) 1998 W3C (MIT, INRIA, Keio), All Rights Reserved. Author: Dave Raggett <dsr@w3.org> --> <!--==================== OBJECT ======================================--> <!-- OBJECT is used to embed objects as part of HTML pages PARAM elements should precede other content. Parameters can also be expressed as attribute/value pairs on the object element itself when brevity is desired. --> <!ENTITY % object.extra ""> <!ELEMENT object (#PCDATA | param | %block; | %inline; | %misc;)*> <!ATTLIST object %attrs; declare (declare) #IMPLIED classid %URI; #IMPLIED codebase %URI; #IMPLIED data %URI; #IMPLIED type %ContentType; #IMPLIED codetype %ContentType; #IMPLIED archive %URI; #IMPLIED standby %Text; #IMPLIED height %Length; #IMPLIED width %Length; #IMPLIED usemap %URI; #IMPLIED name CDATA #IMPLIED tabindex %Number; #IMPLIED author CDATA #IMPLIED copyright CDATA #IMPLIED %object.extra; > <!-- PARAM is used to supply a named property value. In XML it would seem natural to follow RDF and support an abbreviated syntax where the param elements are replaced by attribute value pairs on the OBJECT start tag. --> <!ELEMENT param EMPTY > <!ATTLIST param id ID #IMPLIED name CDATA #REQUIRED value CDATA #IMPLIED valuetype (data|ref|object) "data" type %ContentType; #IMPLIED >
<!-- Applet DTD for Voyager. The associated param element is defined in the object DTD. Copyright (c) 1998 W3C (MIT, INRIA, Keio), All Rights Reserved. Author: Dave Raggett <dsr@w3.org> --> <!--=================== Java APPLET ==================================--> <!-- One of code or object attributes must be present. Place PARAM elements before other content. --> <!ELEMENT applet (#PCDATA | param | %block; | %inline; | %misc;)*> <!ATTLIST applet %coreattrs; codebase %URI; #IMPLIED archive CDATA #IMPLIED code CDATA #IMPLIED object CDATA #IMPLIED alt %Text; #IMPLIED name CDATA #IMPLIED width %Length; #REQUIRED height %Length; #REQUIRED align %IAlign; #IMPLIED hspace %Pixels; #IMPLIED vspace %Pixels; #IMPLIED >
<!-- Frameset DTD for Voyager. Copyright (c) 1998 W3C (MIT, INRIA, Keio), All Rights Reserved. Author: Dave Raggett <dsr@w3.org> --> <!--======================= Frames =======================================--> <!-- only one noframes element permitted per document --> <!ELEMENT frameset (frameset|frame|noframes)*> <!ATTLIST frameset %coreattrs; rows %MultiLengths; #IMPLIED cols %MultiLengths; #IMPLIED onload %Script; #IMPLIED onunload %Script; #IMPLIED > <!-- reserved frame names start with "_" otherwise starts with letter --> <!-- tiled window within frameset --> <!ELEMENT frame EMPTY> <!ATTLIST frame %coreattrs; longdesc %URI; #IMPLIED name CDATA #IMPLIED frameborder (1|0) "1" marginwidth %Pixels; #IMPLIED marginheight %Pixels; #IMPLIED noresize (noresize) #IMPLIED scrolling (yes|no|auto) "auto" > <!-- inline subwindow --> <!ELEMENT iframe %Flow;> <!ATTLIST iframe %coreattrs; longdesc %URI; #IMPLIED name CDATA #IMPLIED src %URI; #IMPLIED frameborder (1|0) "1" marginwidth %Pixels; #IMPLIED marginheight %Pixels; #IMPLIED scrolling (yes|no|auto) "auto" align %IAlign; #IMPLIED height %Length; #IMPLIED width %Length; #IMPLIED >
<!--
Base DTD defining core HTML features for Voyager.
This should be imported after the other Voyager DTDs.
Copyright (c) 1998 W3C (MIT, INRIA, Keio), All Rights Reserved.
Author: Dave Raggett <dsr@w3.org>
-->
<!--=================== Document Body ====================================-->
<!ENTITY % body.extra "">
<!ENTITY % body.content "%Block;">
<!ELEMENT body %body.content;>
<!ATTLIST body
%attrs;
onload %Script; #IMPLIED
onunload %Script; #IMPLIED
%body.extra;
>
<!ELEMENT div %Flow;> <!-- generic language/style container -->
<!ATTLIST div
%attrs;
>
<!--===================== Inline Elements ================================-->
<!ELEMENT span %Inline;> <!-- generic language/style container -->
<!ATTLIST span
%attrs;
>
<!ELEMENT bdo %Inline;> <!-- I18N BiDi over-ride -->
<!ATTLIST bdo
%coreattrs;
lang %LanguageCode; #IMPLIED
dir (ltr|rtl) #REQUIRED
>
<!ENTITY % br.extra "">
<!ELEMENT br EMPTY> <!-- forced line break -->
<!ATTLIST br
%coreattrs;
%br.extra;
>
<!--================== The Anchor Element ================================-->
<!ENTITY % a.extra "">
<!ELEMENT a %Inline;> <!-- anchors shouldn't be nested -->
<!ATTLIST a
%attrs;
charset %Charset; #IMPLIED
type %ContentType; #IMPLIED
name CDATA #IMPLIED
href %URI; #IMPLIED
hreflang %LanguageCode; #IMPLIED
rel %LinkTypes; #IMPLIED
rev %LinkTypes; #IMPLIED
accesskey %Character; #IMPLIED
shape %Shape; "rect"
coords %Coords; #IMPLIED
tabindex %Number; #IMPLIED
onfocus %Script; #IMPLIED
onblur %Script; #IMPLIED
xml:link CDATA #FIXED "simple"
%a.extra;
>
<!--================== The LINK Element ==================================-->
<!--
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
>
<!--=================== Paragraphs =======================================-->
<!ENTITY % p.extra "">
<!ELEMENT p %Inline;>
<!ATTLIST p
%attrs;
%p.extra;
>
<!--=================== Headings =========================================-->
<!--
There are six levels of headings from H1 (the most important)
to H6 (the least important).
-->
<!ENTITY % headings.extra "">
<!ELEMENT h1 %Inline;>
<!ATTLIST h1
%attrs;
%headings.extra;
>
<!ELEMENT h2 %Inline;>
<!ATTLIST h2
%attrs;
%headings.extra;
>
<!ELEMENT h3 %Inline;>
<!ATTLIST h3
%attrs;
%headings.extra;
>
<!ELEMENT h4 %Inline;>
<!ATTLIST h4
%attrs;
%headings.extra;
>
<!ELEMENT h5 %Inline;>
<!ATTLIST h5
%attrs;
%headings.extra;
>
<!ELEMENT h6 %Inline;>
<!ATTLIST h6
%attrs;
%headings.extra;
>
<!--=================== 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.
-->
<!ELEMENT ins %Flow;>
<!ATTLIST ins
%attrs;
cite %URI; #IMPLIED
datetime %Datetime; #IMPLIED
>
<!ELEMENT del %Flow;>
<!ATTLIST del
%attrs;
cite %URI; #IMPLIED
datetime %Datetime; #IMPLIED
>
<!--================ Document Head =======================================-->
<!ELEMENT head (title, base?, (script|style|meta|link)*)>
<!ATTLIST head
%i18n;
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;>
<!-- document base URI -->
<!ENTITY % base.extra "">
<!ELEMENT base EMPTY>
<!ATTLIST base
href %URI; #IMPLIED
%base.extra;
>
<!-- generic metainformation -->
<!ELEMENT meta EMPTY>
<!ATTLIST meta
%i18n;
http-equiv CDATA #IMPLIED
name CDATA #IMPLIED
content CDATA #REQUIRED
scheme CDATA #IMPLIED
>
<!-- style info, which may include CDATA sections -->
<!ELEMENT style (#PCDATA)>
<!ATTLIST style
%i18n;
type %ContentType; #REQUIRED
media %MediaDesc; #IMPLIED
title %Text; #IMPLIED
xml:space CDATA #FIXED "preserve"
>
<!-- script statements, which may include CDATA sections -->
<!ELEMENT script (#PCDATA)>
<!ATTLIST script
charset %Charset; #IMPLIED
type %ContentType; #REQUIRED
language CDATA #IMPLIED
src %URI; #IMPLIED
defer (defer) #IMPLIED
xml:space CDATA #FIXED "preserve"
>
<!-- alternate content container for non script-based rendering -->
<!ENTITY % noscript.content "%Block;">
<!ELEMENT noscript %noscript.content;>
<!ATTLIST noscript
%attrs;
>
<!--================ Document Structure ==================================-->
<!-- the namespace URI designates the document profile -->
<!ELEMENT html (%html.content;)>
<!ATTLIST html
%i18n;
xmlns %URI; #REQUIRED
>
<!-- Portions (C) International Organization for Standardization 1986
Permission to copy in any form is granted for use with
conforming SGML systems and applications as defined in
ISO 8879, provided this notice is included in all copies.
-->
<!-- Character entity set. Typical invocation:
<!ENTITY % HTMLlat1 PUBLIC
"-//W3C//ENTITIES Full Latin 1//EN//HTML">
%HTMLlat1;
-->
<!ENTITY nbsp " "> <!-- no-break space = non-breaking space,
U+00A0 ISOnum -->
<!ENTITY iexcl "¡"> <!-- inverted exclamation mark, U+00A1 ISOnum -->
<!ENTITY cent "¢"> <!-- cent sign, U+00A2 ISOnum -->
<!ENTITY pound "£"> <!-- pound sign, U+00A3 ISOnum -->
<!ENTITY curren "¤"> <!-- currency sign, U+00A4 ISOnum -->
<!ENTITY yen "¥"> <!-- yen sign = yuan sign, U+00A5 ISOnum -->
<!ENTITY brvbar "¦"> <!-- broken bar = broken vertical bar,
U+00A6 ISOnum -->
<!ENTITY sect "§"> <!-- section sign, U+00A7 ISOnum -->
<!ENTITY uml "¨"> <!-- diaeresis = spacing diaeresis,
U+00A8 ISOdia -->
<!ENTITY copy "©"> <!-- copyright sign, U+00A9 ISOnum -->
<!ENTITY ordf "ª"> <!-- feminine ordinal indicator, U+00AA ISOnum -->
<!ENTITY laquo "«"> <!-- left-pointing double angle quotation mark
= left pointing guillemet, U+00AB ISOnum -->
<!ENTITY not "¬"> <!-- not sign = discretionary hyphen,
U+00AC ISOnum -->
<!ENTITY shy "­"> <!-- soft hyphen = discretionary hyphen,
U+00AD ISOnum -->
<!ENTITY reg "®"> <!-- registered sign = registered trade mark sign,
U+00AE ISOnum -->
<!ENTITY macr "¯"> <!-- macron = spacing macron = overline
= APL overbar, U+00AF ISOdia -->
<!ENTITY deg "°"> <!-- degree sign, U+00B0 ISOnum -->
<!ENTITY plusmn "±"> <!-- plus-minus sign = plus-or-minus sign,
U+00B1 ISOnum -->
<!ENTITY sup2 "²"> <!-- superscript two = superscript digit two
= squared, U+00B2 ISOnum -->
<!ENTITY sup3 "³"> <!-- superscript three = superscript digit three
= cubed, U+00B3 ISOnum -->
<!ENTITY acute "´"> <!-- acute accent = spacing acute,
U+00B4 ISOdia -->
<!ENTITY micro "µ"> <!-- micro sign, U+00B5 ISOnum -->
<!ENTITY para "¶"> <!-- pilcrow sign = paragraph sign,
U+00B6 ISOnum -->
<!ENTITY middot "·"> <!-- middle dot = Georgian comma
= Greek middle dot, U+00B7 ISOnum -->
<!ENTITY cedil "¸"> <!-- cedilla = spacing cedilla, U+00B8 ISOdia -->
<!ENTITY sup1 "¹"> <!-- superscript one = superscript digit one,
U+00B9 ISOnum -->
<!ENTITY ordm "º"> <!-- masculine ordinal indicator,
U+00BA ISOnum -->
<!ENTITY raquo "»"> <!-- right-pointing double angle quotation mark
= right pointing guillemet, U+00BB ISOnum -->
<!ENTITY frac14 "¼"> <!-- vulgar fraction one quarter
= fraction one quarter, U+00BC ISOnum -->
<!ENTITY frac12 "½"> <!-- vulgar fraction one half
= fraction one half, U+00BD ISOnum -->
<!ENTITY frac34 "¾"> <!-- vulgar fraction three quarters
= fraction three quarters, U+00BE ISOnum -->
<!ENTITY iquest "¿"> <!-- inverted question mark
= turned question mark, U+00BF ISOnum -->
<!ENTITY Agrave "À"> <!-- latin capital letter A with grave
= latin capital letter A grave,
U+00C0 ISOlat1 -->
<!ENTITY Aacute "Á"> <!-- latin capital letter A with acute,
U+00C1 ISOlat1 -->
<!ENTITY Acirc "Â"> <!-- latin capital letter A with circumflex,
U+00C2 ISOlat1 -->
<!ENTITY Atilde "Ã"> <!-- latin capital letter A with tilde,
U+00C3 ISOlat1 -->
<!ENTITY Auml "Ä"> <!-- latin capital letter A with diaeresis,
U+00C4 ISOlat1 -->
<!ENTITY Aring "Å"> <!-- latin capital letter A with ring above
= latin capital letter A ring,
U+00C5 ISOlat1 -->
<!ENTITY AElig "Æ"> <!-- latin capital letter AE
= latin capital ligature AE,
U+00C6 ISOlat1 -->
<!ENTITY Ccedil "Ç"> <!-- latin capital letter C with cedilla,
U+00C7 ISOlat1 -->
<!ENTITY Egrave "È"> <!-- latin capital letter E with grave,
U+00C8 ISOlat1 -->
<!ENTITY Eacute "É"> <!-- latin capital letter E with acute,
U+00C9 ISOlat1 -->
<!ENTITY Ecirc "Ê"> <!-- latin capital letter E with circumflex,
U+00CA ISOlat1 -->
<!ENTITY Euml "Ë"> <!-- latin capital letter E with diaeresis,
U+00CB ISOlat1 -->
<!ENTITY Igrave "Ì"> <!-- latin capital letter I with grave,
U+00CC ISOlat1 -->
<!ENTITY Iacute "Í"> <!-- latin capital letter I with acute,
U+00CD ISOlat1 -->
<!ENTITY Icirc "Î"> <!-- latin capital letter I with circumflex,
U+00CE ISOlat1 -->
<!ENTITY Iuml "Ï"> <!-- latin capital letter I with diaeresis,
U+00CF ISOlat1 -->
<!ENTITY ETH "Ð"> <!-- latin capital letter ETH, U+00D0 ISOlat1 -->
<!ENTITY Ntilde "Ñ"> <!-- latin capital letter N with tilde,
U+00D1 ISOlat1 -->
<!ENTITY Ograve "Ò"> <!-- latin capital letter O with grave,
U+00D2 ISOlat1 -->
<!ENTITY Oacute "Ó"> <!-- latin capital letter O with acute,
U+00D3 ISOlat1 -->
<!ENTITY Ocirc "Ô"> <!-- latin capital letter O with circumflex,
U+00D4 ISOlat1 -->
<!ENTITY Otilde "Õ"> <!-- latin capital letter O with tilde,
U+00D5 ISOlat1 -->
<!ENTITY Ouml "Ö"> <!-- latin capital letter O with diaeresis,
U+00D6 ISOlat1 -->
<!ENTITY times "×"> <!-- multiplication sign, U+00D7 ISOnum -->
<!ENTITY Oslash "Ø"> <!-- latin capital letter O with stroke
= latin capital letter O slash,
U+00D8 ISOlat1 -->
<!ENTITY Ugrave "Ù"> <!-- latin capital letter U with grave,
U+00D9 ISOlat1 -->
<!ENTITY Uacute "Ú"> <!-- latin capital letter U with acute,
U+00DA ISOlat1 -->
<!ENTITY Ucirc "Û"> <!-- latin capital letter U with circumflex,
U+00DB ISOlat1 -->
<!ENTITY Uuml "Ü"> <!-- latin capital letter U with diaeresis,
U+00DC ISOlat1 -->
<!ENTITY Yacute "Ý"> <!-- latin capital letter Y with acute,
U+00DD ISOlat1 -->
<!ENTITY THORN "Þ"> <!-- latin capital letter THORN,
U+00DE ISOlat1 -->
<!ENTITY szlig "ß"> <!-- latin small letter sharp s = ess-zed,
U+00DF ISOlat1 -->
<!ENTITY agrave "à"> <!-- latin small letter a with grave
= latin small letter a grave,
U+00E0 ISOlat1 -->
<!ENTITY aacute "á"> <!-- latin small letter a with acute,
U+00E1 ISOlat1 -->
<!ENTITY acirc "â"> <!-- latin small letter a with circumflex,
U+00E2 ISOlat1 -->
<!ENTITY atilde "ã"> <!-- latin small letter a with tilde,
U+00E3 ISOlat1 -->
<!ENTITY auml "ä"> <!-- latin small letter a with diaeresis,
U+00E4 ISOlat1 -->
<!ENTITY aring "å"> <!-- latin small letter a with ring above
= latin small letter a ring,
U+00E5 ISOlat1 -->
<!ENTITY aelig "æ"> <!-- latin small letter ae
= latin small ligature ae, U+00E6 ISOlat1 -->
<!ENTITY ccedil "ç"> <!-- latin small letter c with cedilla,
U+00E7 ISOlat1 -->
<!ENTITY egrave "è"> <!-- latin small letter e with grave,
U+00E8 ISOlat1 -->
<!ENTITY eacute "é"> <!-- latin small letter e with acute,
U+00E9 ISOlat1 -->
<!ENTITY ecirc "ê"> <!-- latin small letter e with circumflex,
U+00EA ISOlat1 -->
<!ENTITY euml "ë"> <!-- latin small letter e with diaeresis,
U+00EB ISOlat1 -->
<!ENTITY igrave "ì"> <!-- latin small letter i with grave,
U+00EC ISOlat1 -->
<!ENTITY iacute "í"> <!-- latin small letter i with acute,
U+00ED ISOlat1 -->
<!ENTITY icirc "î"> <!-- latin small letter i with circumflex,
U+00EE ISOlat1 -->
<!ENTITY iuml "ï"> <!-- latin small letter i with diaeresis,
U+00EF ISOlat1 -->
<!ENTITY eth "ð"> <!-- latin small letter eth, U+00F0 ISOlat1 -->
<!ENTITY ntilde "ñ"> <!-- latin small letter n with tilde,
U+00F1 ISOlat1 -->
<!ENTITY ograve "ò"> <!-- latin small letter o with grave,
U+00F2 ISOlat1 -->
<!ENTITY oacute "ó"> <!-- latin small letter o with acute,
U+00F3 ISOlat1 -->
<!ENTITY ocirc "ô"> <!-- latin small letter o with circumflex,
U+00F4 ISOlat1 -->
<!ENTITY otilde "õ"> <!-- latin small letter o with tilde,
U+00F5 ISOlat1 -->
<!ENTITY ouml "ö"> <!-- latin small letter o with diaeresis,
U+00F6 ISOlat1 -->
<!ENTITY divide "÷"> <!-- division sign, U+00F7 ISOnum -->
<!ENTITY oslash "ø"> <!-- latin small letter o with stroke,
= latin small letter o slash,
U+00F8 ISOlat1 -->
<!ENTITY ugrave "ù"> <!-- latin small letter u with grave,
U+00F9 ISOlat1 -->
<!ENTITY uacute "ú"> <!-- latin small letter u with acute,
U+00FA ISOlat1 -->
<!ENTITY ucirc "û"> <!-- latin small letter u with circumflex,
U+00FB ISOlat1 -->
<!ENTITY uuml "ü"> <!-- latin small letter u with diaeresis,
U+00FC ISOlat1 -->
<!ENTITY yacute "ý"> <!-- latin small letter y with acute,
U+00FD ISOlat1 -->
<!ENTITY thorn "þ"> <!-- latin small letter thorn with,
U+00FE ISOlat1 -->
<!ENTITY yuml "ÿ"> <!-- latin small letter y with diaeresis,
U+00FF ISOlat1 -->
<!-- Special characters for HTML -->
<!-- Character entity set. Typical invocation:
<!ENTITY % HTMLspecial PUBLIC
"-//W3C//ENTITIES Special//EN//HTML">
%HTMLspecial; -->
<!-- Portions (C) International Organization for Standardization 1986:
Permission to copy in any form is granted for use with
conforming SGML systems and applications as defined in
ISO 8879, provided this notice is included in all copies.
-->
<!-- Relevant ISO entity set is given unless names are newly introduced.
New names (i.e., not in ISO 8879 list) do not clash with any
existing ISO 8879 entity names. ISO 10646 character numbers
are given for each character, in hex. values are decimal
conversions of the ISO 10646 values and refer to the document
character set. Names are Unicode 2.0 names.
-->
<!-- C0 Controls and Basic Latin -->
<!ENTITY quot """> <!-- quotation mark = APL quote,
U+0022 ISOnum -->
<!ENTITY amp "&"> <!-- ampersand, U+0026 ISOnum -->
<!ENTITY lt "<"> <!-- less-than sign, U+003C ISOnum -->
<!ENTITY gt ">"> <!-- greater-than sign, U+003E ISOnum -->
<!-- Latin Extended-A -->
<!ENTITY OElig "Œ"> <!-- latin capital ligature OE,
U+0152 ISOlat2 -->
<!ENTITY oelig "œ"> <!-- latin small ligature oe, U+0153 ISOlat2 -->
<!-- ligature is a misnomer, this is a separate character in some languages -->
<!ENTITY Scaron "Š"> <!-- latin capital letter S with caron,
U+0160 ISOlat2 -->
<!ENTITY scaron "š"> <!-- latin small letter s with caron,
U+0161 ISOlat2 -->
<!ENTITY Yuml "Ÿ"> <!-- latin capital letter Y with diaeresis,
U+0178 ISOlat2 -->
<!-- Spacing Modifier Letters -->
<!ENTITY circ "ˆ"> <!-- modifier letter circumflex accent,
U+02C6 ISOpub -->
<!ENTITY tilde "˜"> <!-- small tilde, U+02DC ISOdia -->
<!-- General Punctuation -->
<!ENTITY ensp " "> <!-- en space, U+2002 ISOpub -->
<!ENTITY emsp " "> <!-- em space, U+2003 ISOpub -->
<!ENTITY thinsp " "> <!-- thin space, U+2009 ISOpub -->
<!ENTITY zwnj "‌"> <!-- zero width non-joiner,
U+200C NEW RFC 2070 -->
<!ENTITY zwj "‍"> <!-- zero width joiner, U+200D NEW RFC 2070 -->
<!ENTITY lrm "‎"> <!-- left-to-right mark, U+200E NEW RFC 2070 -->
<!ENTITY rlm "‏"> <!-- right-to-left mark, U+200F NEW RFC 2070 -->
<!ENTITY ndash "–"> <!-- en dash, U+2013 ISOpub -->
<!ENTITY mdash "—"> <!-- em dash, U+2014 ISOpub -->
<!ENTITY lsquo "‘"> <!-- left single quotation mark,
U+2018 ISOnum -->
<!ENTITY rsquo "’"> <!-- right single quotation mark,
U+2019 ISOnum -->
<!ENTITY sbquo "‚"> <!-- single low-9 quotation mark, U+201A NEW -->
<!ENTITY ldquo "“"> <!-- left double quotation mark,
U+201C ISOnum -->
<!ENTITY rdquo "”"> <!-- right double quotation mark,
U+201D ISOnum -->
<!ENTITY bdquo "„"> <!-- double low-9 quotation mark, U+201E NEW -->
<!ENTITY dagger "†"> <!-- dagger, U+2020 ISOpub -->
<!ENTITY Dagger "‡"> <!-- double dagger, U+2021 ISOpub -->
<!ENTITY permil "‰"> <!-- per mille sign, U+2030 ISOtech -->
<!ENTITY lsaquo "‹"> <!-- single left-pointing angle quotation mark,
U+2039 ISO proposed -->
<!-- lsaquo is proposed but not yet ISO standardised -->
<!ENTITY rsaquo "›"> <!-- single right-pointing angle quotation mark,
U+203A ISO proposed -->
<!-- rsaquo is proposed but not yet ISO standardised -->
<!ENTITY euro "€"> <!-- euro sign, U+20AC NEW -->
<!-- Mathematical, Greek and Symbolic characters for HTML -->
<!-- Character entity set. Typical invocation:
<!ENTITY % HTMLsymbol PUBLIC
"-//W3C//ENTITIES Symbolic//EN//HTML">
%HTMLsymbol; -->
<!-- Portions (C) International Organization for Standardization 1986:
Permission to copy in any form is granted for use with
conforming SGML systems and applications as defined in
ISO 8879, provided this notice is included in all copies.
-->
<!-- Relevant ISO entity set is given unless names are newly introduced.
New names (i.e., not in ISO 8879 list) do not clash with any
existing ISO 8879 entity names. ISO 10646 character numbers
are given for each character, in hex. values are decimal
conversions of the ISO 10646 values and refer to the document
character set. Names are Unicode 2.0 names.
-->
<!-- Latin Extended-B -->
<!ENTITY fnof "ƒ"> <!-- latin small f with hook = function
= florin, U+0192 ISOtech -->
<!-- Greek -->
<!ENTITY Alpha "Α"> <!-- greek capital letter alpha, U+0391 -->
<!ENTITY Beta "Β"> <!-- greek capital letter beta, U+0392 -->
<!ENTITY Gamma "Γ"> <!-- greek capital letter gamma,
U+0393 ISOgrk3 -->
<!ENTITY Delta "Δ"> <!-- greek capital letter delta,
U+0394 ISOgrk3 -->
<!ENTITY Epsilon "Ε"> <!-- greek capital letter epsilon, U+0395 -->
<!ENTITY Zeta "Ζ"> <!-- greek capital letter zeta, U+0396 -->
<!ENTITY Eta "Η"> <!-- greek capital letter eta, U+0397 -->
<!ENTITY Theta "Θ"> <!-- greek capital letter theta,
U+0398 ISOgrk3 -->
<!ENTITY Iota "Ι"> <!-- greek capital letter iota, U+0399 -->
<!ENTITY Kappa "Κ"> <!-- greek capital letter kappa, U+039A -->
<!ENTITY Lambda "Λ"> <!-- greek capital letter lambda,
U+039B ISOgrk3 -->
<!ENTITY Mu "Μ"> <!-- greek capital letter mu, U+039C -->
<!ENTITY Nu "Ν"> <!-- greek capital letter nu, U+039D -->
<!ENTITY Xi "Ξ"> <!-- greek capital letter xi, U+039E ISOgrk3 -->
<!ENTITY Omicron "Ο"> <!-- greek capital letter omicron, U+039F -->
<!ENTITY Pi "Π"> <!-- greek capital letter pi, U+03A0 ISOgrk3 -->
<!ENTITY Rho "Ρ"> <!-- greek capital letter rho, U+03A1 -->
<!-- there is no Sigmaf, and no U+03A2 character either -->
<!ENTITY Sigma "Σ"> <!-- greek capital letter sigma,
U+03A3 ISOgrk3 -->
<!ENTITY Tau "Τ"> <!-- greek capital letter tau, U+03A4 -->
<!ENTITY Upsilon "Υ"> <!-- greek capital letter upsilon,
U+03A5 ISOgrk3 -->
<!ENTITY Phi "Φ"> <!-- greek capital letter phi,
U+03A6 ISOgrk3 -->
<!ENTITY Chi "Χ"> <!-- greek capital letter chi, U+03A7 -->
<!ENTITY Psi "Ψ"> <!-- greek capital letter psi,
U+03A8 ISOgrk3 -->
<!ENTITY Omega "Ω"> <!-- greek capital letter omega,
U+03A9 ISOgrk3 -->
<!ENTITY alpha "α"> <!-- greek small letter alpha,
U+03B1 ISOgrk3 -->
<!ENTITY beta "β"> <!-- greek small letter beta, U+03B2 ISOgrk3 -->
<!ENTITY gamma "γ"> <!-- greek small letter gamma,
U+03B3 ISOgrk3 -->
<!ENTITY delta "δ"> <!-- greek small letter delta,
U+03B4 ISOgrk3 -->
<!ENTITY epsilon "ε"> <!-- greek small letter epsilon,
U+03B5 ISOgrk3 -->
<!ENTITY zeta "ζ"> <!-- greek small letter zeta, U+03B6 ISOgrk3 -->
<!ENTITY eta "η"> <!-- greek small letter eta, U+03B7 ISOgrk3 -->
<!ENTITY theta "θ"> <!-- greek small letter theta,
U+03B8 ISOgrk3 -->
<!ENTITY iota "ι"> <!-- greek small letter iota, U+03B9 ISOgrk3 -->
<!ENTITY kappa "κ"> <!-- greek small letter kappa,
U+03BA ISOgrk3 -->
<!ENTITY lambda "λ"> <!-- greek small letter lambda,
U+03BB ISOgrk3 -->
<!ENTITY mu "μ"> <!-- greek small letter mu, U+03BC ISOgrk3 -->
<!ENTITY nu "ν"> <!-- greek small letter nu, U+03BD ISOgrk3 -->
<!ENTITY xi "ξ"> <!-- greek small letter xi, U+03BE ISOgrk3 -->
<!ENTITY omicron "ο"> <!-- greek small letter omicron, U+03BF NEW -->
<!ENTITY pi "π"> <!-- greek small letter pi, U+03C0 ISOgrk3 -->
<!ENTITY rho "ρ"> <!-- greek small letter rho, U+03C1 ISOgrk3 -->
<!ENTITY sigmaf "ς"> <!-- greek small letter final sigma,
U+03C2 ISOgrk3 -->
<!ENTITY sigma "σ"> <!-- greek small letter sigma,
U+03C3 ISOgrk3 -->
<!ENTITY tau "τ"> <!-- greek small letter tau, U+03C4 ISOgrk3 -->
<!ENTITY upsilon "υ"> <!-- greek small letter upsilon,
U+03C5 ISOgrk3 -->
<!ENTITY phi "φ"> <!-- greek small letter phi, U+03C6 ISOgrk3 -->
<!ENTITY chi "χ"> <!-- greek small letter chi, U+03C7 ISOgrk3 -->
<!ENTITY psi "ψ"> <!-- greek small letter psi, U+03C8 ISOgrk3 -->
<!ENTITY omega "ω"> <!-- greek small letter omega,
U+03C9 ISOgrk3 -->
<!ENTITY thetasym "ϑ"> <!-- greek small letter theta symbol,
U+03D1 NEW -->
<!ENTITY upsih "ϒ"> <!-- greek upsilon with hook symbol,
U+03D2 NEW -->
<!ENTITY piv "ϖ"> <!-- greek pi symbol, U+03D6 ISOgrk3 -->
<!-- General Punctuation -->
<!ENTITY bull "•"> <!-- bullet = black small circle,
U+2022 ISOpub -->
<!-- bullet is NOT the same as bullet operator, U+2219 -->
<!ENTITY hellip "…"> <!-- horizontal ellipsis = three dot leader,
U+2026 ISOpub -->
<!ENTITY prime "′"> <!-- prime = minutes = feet, U+2032 ISOtech -->
<!ENTITY Prime "″"> <!-- double prime = seconds = inches,
U+2033 ISOtech -->
<!ENTITY oline "‾"> <!-- overline = spacing overscore,
U+203E NEW -->
<!ENTITY frasl "⁄"> <!-- fraction slash, U+2044 NEW -->
<!-- Letterlike Symbols -->
<!ENTITY weierp "℘"> <!-- script capital P = power set
= Weierstrass p, U+2118 ISOamso -->
<!ENTITY image "ℑ"> <!-- blackletter capital I = imaginary part,
U+2111 ISOamso -->
<!ENTITY real "ℜ"> <!-- blackletter capital R = real part symbol,
U+211C ISOamso -->
<!ENTITY trade "™"> <!-- trade mark sign, U+2122 ISOnum -->
<!ENTITY alefsym "ℵ"> <!-- alef symbol = first transfinite cardinal,
U+2135 NEW -->
<!-- alef symbol is NOT the same as hebrew letter alef,
U+05D0 although the same glyph could be used to depict both characters -->
<!-- Arrows -->
<!ENTITY larr "←"> <!-- leftwards arrow, U+2190 ISOnum -->
<!ENTITY uarr "↑"> <!-- upwards arrow, U+2191 ISOnum-->
<!ENTITY rarr "→"> <!-- rightwards arrow, U+2192 ISOnum -->
<!ENTITY darr "↓"> <!-- downwards arrow, U+2193 ISOnum -->
<!ENTITY harr "↔"> <!-- left right arrow, U+2194 ISOamsa -->
<!ENTITY crarr "↵"> <!-- downwards arrow with corner leftwards
= carriage return, U+21B5 NEW -->
<!ENTITY lArr "⇐"> <!-- leftwards double arrow, U+21D0 ISOtech -->
<!-- Unicode does not say that lArr is the same as the 'is implied by' arrow
but also does not have any other character for that function. So ? lArr can
be used for 'is implied by' as ISOtech suggests -->
<!ENTITY uArr "⇑"> <!-- upwards double arrow, U+21D1 ISOamsa -->
<!ENTITY rArr "⇒"> <!-- rightwards double arrow,
U+21D2 ISOtech -->
<!-- Unicode does not say this is the 'implies' character but does not have
another character with this function so ?
rArr can be used for 'implies' as ISOtech suggests -->
<!ENTITY dArr "⇓"> <!-- downwards double arrow, U+21D3 ISOamsa -->
<!ENTITY hArr "⇔"> <!-- left right double arrow,
U+21D4 ISOamsa -->
<!-- Mathematical Operators -->
<!ENTITY forall "∀"> <!-- for all, U+2200 ISOtech -->
<!ENTITY part "∂"> <!-- partial differential, U+2202 ISOtech -->
<!ENTITY exist "∃"> <!-- there exists, U+2203 ISOtech -->
<!ENTITY empty "∅"> <!-- empty set = null set = diameter,
U+2205 ISOamso -->
<!ENTITY nabla "∇"> <!-- nabla = backward difference,
U+2207 ISOtech -->
<!ENTITY isin "∈"> <!-- element of, U+2208 ISOtech -->
<!ENTITY notin "∉"> <!-- not an element of, U+2209 ISOtech -->
<!ENTITY ni "∋"> <!-- contains as member, U+220B ISOtech -->
<!-- should there be a more memorable name than 'ni'? -->
<!ENTITY prod "∏"> <!-- n-ary product = product sign,
U+220F ISOamsb -->
<!-- prod is NOT the same character as U+03A0 'greek capital letter pi' though
the same glyph might be used for both -->
<!ENTITY sum "∑"> <!-- n-ary sumation, U+2211 ISOamsb -->
<!-- sum is NOT the same character as U+03A3 'greek capital letter sigma'
though the same glyph might be used for both -->
<!ENTITY minus "−"> <!-- minus sign, U+2212 ISOtech -->
<!ENTITY lowast "∗"> <!-- asterisk operator, U+2217 ISOtech -->
<!ENTITY radic "√"> <!-- square root = radical sign,
U+221A ISOtech -->
<!ENTITY prop "∝"> <!-- proportional to, U+221D ISOtech -->
<!ENTITY infin "∞"> <!-- infinity, U+221E ISOtech -->
<!ENTITY ang "∠"> <!-- angle, U+2220 ISOamso -->
<!ENTITY and "∧"> <!-- logical and = wedge, U+2227 ISOtech -->
<!ENTITY or "∨"> <!-- logical or = vee, U+2228 ISOtech -->
<!ENTITY cap "∩"> <!-- intersection = cap, U+2229 ISOtech -->
<!ENTITY cup "∪"> <!-- union = cup, U+222A ISOtech -->
<!ENTITY int "∫"> <!-- integral, U+222B ISOtech -->
<!ENTITY there4 "∴"> <!-- therefore, U+2234 ISOtech -->
<!ENTITY sim "∼"> <!-- tilde operator = varies with = similar to,
U+223C ISOtech -->
<!-- tilde operator is NOT the same character as the tilde, U+007E,
although the same glyph might be used to represent both -->
<!ENTITY cong "≅"> <!-- approximately equal to, U+2245 ISOtech -->
<!ENTITY asymp "≈"> <!-- almost equal to = asymptotic to,
U+2248 ISOamsr -->
<!ENTITY ne "≠"> <!-- not equal to, U+2260 ISOtech -->
<!ENTITY equiv "≡"> <!-- identical to, U+2261 ISOtech -->
<!ENTITY le "≤"> <!-- less-than or equal to, U+2264 ISOtech -->
<!ENTITY ge "≥"> <!-- greater-than or equal to,
U+2265 ISOtech -->
<!ENTITY sub "⊂"> <!-- subset of, U+2282 ISOtech -->
<!ENTITY sup "⊃"> <!-- superset of, U+2283 ISOtech -->
<!-- note that nsup, 'not a superset of, U+2283' is not covered by the Symbol
font encoding and is not included. Should it be, for symmetry?
It is in ISOamsn -->
<!ENTITY nsub "⊄"> <!-- not a subset of, U+2284 ISOamsn -->
<!ENTITY sube "⊆"> <!-- subset of or equal to, U+2286 ISOtech -->
<!ENTITY supe "⊇"> <!-- superset of or equal to,
U+2287 ISOtech -->
<!ENTITY oplus "⊕"> <!-- circled plus = direct sum,
U+2295 ISOamsb -->
<!ENTITY otimes "⊗"> <!-- circled times = vector product,
U+2297 ISOamsb -->
<!ENTITY perp "⊥"> <!-- up tack = orthogonal to = perpendicular,
U+22A5 ISOtech -->
<!ENTITY sdot "⋅"> <!-- dot operator, U+22C5 ISOamsb -->
<!-- dot operator is NOT the same character as U+00B7 middle dot -->
<!-- Miscellaneous Technical -->
<!ENTITY lceil "⌈"> <!-- left ceiling = apl upstile,
U+2308 ISOamsc -->
<!ENTITY rceil "⌉"> <!-- right ceiling, U+2309 ISOamsc -->
<!ENTITY lfloor "⌊"> <!-- left floor = apl downstile,
U+230A ISOamsc -->
<!ENTITY rfloor "⌋"> <!-- right floor, U+230B ISOamsc -->
<!ENTITY lang "〈"> <!-- left-pointing angle bracket = bra,
U+2329 ISOtech -->
<!-- lang is NOT the same character as U+003C 'less than'
or U+2039 'single left-pointing angle quotation mark' -->
<!ENTITY rang "〉"> <!-- right-pointing angle bracket = ket,
U+232A ISOtech -->
<!-- rang is NOT the same character as U+003E 'greater than'
or U+203A 'single right-pointing angle quotation mark' -->
<!-- Geometric Shapes -->
<!ENTITY loz "◊"> <!-- lozenge, U+25CA ISOpub -->
<!-- Miscellaneous Symbols -->
<!ENTITY spades "♠"> <!-- black spade suit, U+2660 ISOpub -->
<!-- black here seems to mean filled as opposed to hollow -->
<!ENTITY clubs "♣"> <!-- black club suit = shamrock,
U+2663 ISOpub -->
<!ENTITY hearts "♥"> <!-- black heart suit = valentine,
U+2665 ISOpub -->
<!ENTITY diams "♦"> <!-- black diamond suit, U+2666 ISOpub -->