Mixing Your Applications into XHTML
An even more important feature of Modular XHTML is the
option to add new elements that HTML doesn’t support. For instance,
to include SVG pictures in your documents, you just have to import
the SVG DTD and redefine the Misc.extra
parameter entity to allow the
SVG root element svg
. (This only
lets you validate XHTML documents that contain SVG markup. It
doesn’t magically give the browser the ability to render these
pictures.) You accomplish this by redefining any of these three
parameter entity references:
%Inline.extra;
Place the root elements of your application here if you want them to be added to the content specifications of inline elements, such as
span
,em
,code
, andtextarea
.%Block.extra;
Place the root elements of your application here if you want them to be added to the content specifications of block elements, such as
div
,h1
,p
, andpre
.%Misc.extra;
Place the root elements of your application here if you want them to be added to the content specifications of both block and inline elements.
The definition of each of these parameter entities should be a
list of the elements you want to add to the content specification
separated by vertical bars and beginning with a vertical bar. For
instance, to include MathML equations as both inline and block
elements, you’d import the MathML DTD and redefine the Misc.extra
parameter entity to include the
MathML root element math
like
this:
<!ENTITY % Misc.extra "| math">
If you wanted to allow block-level ...
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