The "figure" element groups an optional "preamble" element, an
   "artwork" element, and an optional "postamble" element together. The
   "figure" element also has an optional "anchor" attribute that is used
   for cross-referencing with the "xref" element (Section 2.3.1.4).
   There is also an optional "title" attribute that identifies the title
   of the figure.

   The "preamble" and "postamble" elements, if present, are simply text.
   If a cross-reference is needed to a section, figure, or reference,
   the "xref" element (Section 2.3.1.4) is used; similarly, if an
   external-reference is needed, the "eref" element (Section 2.3.1.5) is
   used. Indexing of text is provided by the the "iref" element (Section
   2.3.1.6).

   The "artwork" element, which must be present, contains "ASCII
   artwork". Unlike text contained in the "t", "preamble", or
   "postamble" elements, both horizontal and vertical whitespace is
   significant in the "artwork" element.












 
RFC 2629            Writing I-Ds and RFCs using XML            June 1999


   So, putting it all together, we have, e.g.,

       <figure anchor="figure_example">
           So,
           putting it all together, we have, e.g.,
           
               ascii artwork goes here...

               be sure to use "<" or "&" instead of "<" and "&",
               respectively!
           
           which is a very simple example.
       

   which is a very simple example.

   If you have artwork with a lot of "<" characters, then there's an XML
   trick you can use:

       
           If you have artwork with a lot of "<"
           characters, then there's an XML trick you can
           use:
           <![CDATA[
               ascii artwork goes here...

               just don't use "]]" in your artwork!
           ]]>
           The "<![CDATA[ ... ]]>" construct is called
           a CDATA block -- everything between the innermost brackets
           is left alone by the XML application.
       

   The "<![CDATA[ ... ]]>" construct is called a CDATA block --
   everything between the innermost brackets is left alone by the XML
   application.

   Because the "figure" element represents a logical grouping of text
   and artwork, an XML application producing a text version of the
   document should attempt to keep these elements on the same page.
   Because RFC 2223 [2] allows no more than 69 characters by 49 lines of
   content on each page, XML applications should be prepared to
   prematurely introduce page breaks to allow for better visual
   grouping.








 
RFC 2629            Writing I-Ds and RFCs using XML            June 1999


   Finally, the "artwork" element has two optional attributes: "name"
   and "type". The former is used to suggest a filename to use when
   storing the content of the "artwork" element, whilst the latter
   contains a suggestive data-typing for the content.

2.3.1.4 The xref Element

   The "xref" element is used to cross-reference sections, figures, and
   references. The mandatory "target" attribute is used to link back to
   the "anchor" attribute of the "section", "figure", and "reference"