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        align  (%horiz.align) #IMPLIED -- horizontal alignment --
        valign (%vert.align)  top  -- vertical alignment --
        dp     CDATA     #IMPLIED  -- decimal point e.g. dp="," --
        nowrap (nowrap)  #IMPLIED  -- don't wrap words --
        >

<!--
    Note that table cells can include nested tables.
    Missing cells are considered to be empty, while
    missing rows should be ignored, i.e. if a cell
    spans a row and there are no further TR elements
    then the implied row should be ignored.
-->

<!ELEMENT (%cell) - O %body.content>
<!ATTLIST (%cell)
        %attrs;
        colspan NUMBER    1      -- columns spanned --
        rowspan NUMBER    1      -- rows spanned --
        align  (%horiz.align) #IMPLIED -- horizontal alignment --
        valign (%vert.align) top -- vertical alignment --
        dp      CDATA    #IMPLIED  -- decimal point e.g. dp="," --
        nowrap (nowrap)  #IMPLIED  -- don't wrap words --
        axis CDATA #IMPLIED -- axis name, defaults to element content --
        axes CDATA #IMPLIED -- comma separated list of axis names --
        >

<!--====================== Figures ========================================-->

<!--
  The element contains text for use in non-graphical displays. Note that
  you can use the shape attribute in anchors to specify hotzones on images.
  This provides for local processing of pointer clicks and a unified method
  for dealing with graphical and non-graphical displays.

  Text is flowed around figures when the figure is left or right aligned.
  You can request the browser to move down until there is enough room for
  the next element, see the CLEAR and NEED attributes (in %needs)

  Figures offer a path towards embedding arbitrary information formats
  via some kind of OLE/OpenDoc mechanism.
-->

<!ELEMENT FIG - - (OVERLAY*, CAPTION?, FIGTEXT, CREDIT?) -(FIG|IMG)>
<!ATTLIST FIG
        %attrs;
        %needs;                  -- for control of text flow --
        src  %URI;  #REQUIRED    -- URI of document to embed --
        %url.link;               -- standard link attributes --
        %block.align;            -- horizontal alignment --
        noflow (noflow) #IMPLIED -- noflow around figure --
        width  NUMBER #IMPLIED   -- desired width in units --
        height NUMBER #IMPLIED   -- desired height in units --
        units (en|pixels) pixels -- specifies units as en's or pixels --
        imagemap (%URI) #IMPLIED -- pass background clicks to server --
        >
        
<!ELEMENT FIGTEXT O O %body.content -- dummy element -->

<!--
    Figure overlays. When combined with local caching, overlays
    provide a cheap way of modifying a larger base image sent as
    part of a previous page.
-->

<!ELEMENT OVERLAY - O EMPTY -- image overlay -->
<!ATTLIST OVERLAY
        src  %URI;  #REQUIRED    -- URI of image overlay --
        %url.link;               -- standard link attributes --
        units (en|pixels) pixels -- specifies units as en's or pixels --
        x      NUMBER   0        -- offset from left in units --
        y      NUMBER   0        -- offset from top in units --
        width  NUMBER #IMPLIED   -- desired width in units --
        height NUMBER #IMPLIED   -- desired height in units --
        imagemap (%URI) #IMPLIED -- pass background clicks to server --
        >

<!ELEMENT CREDIT - - (%text;)* -- source of image -->
<!ATTLIST CREDIT
        %attrs;
        >

<!--======================== Notes ========================================-->

<!--
The NOTE element is used for admonishments. The CLASS attribute
is used to differentiate NOTE's, e.g. Note, Caution or Warning.
-->

<!ELEMENT NOTE - - %body.content; -- admonishment -->
<!ATTLIST NOTE
        %attrs;
        src %URI;   #IMPLIED  -- URI of custom graphic --
        %url.link;            -- standard link attributes --
        %needs; -- for control of text flow --
        >

<!--======================== Footnotes ====================================-->

<!--
Typically rendered as popup note. These elements are referenced
by hypertext links specified with the anchor element.
-->
<!ELEMENT FN - - %body.content;>
<!ATTLIST FN %attrs;>

<!--======================== Math  ========================================-->

<!-- Use &thinsp; &emsp; etc for greater control of spacing. -->

<!-- Subscripts and Superscripts

  <SUB> and <SUP> are used for subscripts and superscripts.

                                          i j
      X <SUP>i</SUP>Y<SUP>j</SUP>  is   X  Y

  i.e. the space following the X disambiguates the binding.
  The align attribute can be used for horizontal alignment,
  e.g. to explicitly place an index above an element:
                                              i
        X<sup align=center>i</sup>  produces  X

Short references are defined for superscripts, subscripts and boxes
to save typing when manually editing HTML math, e.g.

      x^2^    is mapped to   x<sup>2</sup>
      y_z_    is mapped to   y<sub>z</sub>