This function converts a value of type
Camlhighlight_core.t containing
a syntax-highlighted document into its Ocsigen's
XHTML.M representation.
The optional parameter
class_prefix indicates the prefix for the class
names of all XHTML elements produced, while
extra_classes can be used
to provide additional class names for the main container. Also optional
are the boolean parameters
dummy_lines, and
linenums. They indicate
whether the generated XHTML should include dummy lines at the beginning
and end, and line numbers for the code, respectively.