The concept of an area is used to give semantics to flow objects.
The result of formatting a flow object other than the root flow object
is a sequence of areas
The nature of these areas is not fully specified by this International
Standard. An area is a rectangular box with a fixed width and height.
An area is also a specification of a set of marks that can be imaged
on a presentation medium. An area may contain other areas.
In particular, an area may contain a glyph.
Information may be attached to areas depending on the flow object that
produced the area and the context in which it is to be used.
Areas are of two types: display areas and inline areas.
Each type of area is placed in a different way.
For an illustration of the concept of displayed and inlined areas, see
Figure 4, Displayed and Inlined