The presence of a graphic is indicated by the
<graphic> element, usually contained within a <figure>
element which groups together:
-
The title of the graphic (<head>)
-
A description of the graphic (<figDesc>)
for use by software unable to render the graphic
-
The graphic resource itself is pointed to by an url
attribute on the <graphic> element, and may also have attributes scale,
height, width
-
<figure>s may self-nest, and may also contain other
display class items such as <formula>s
