IMPORTANT NOTE:

The class Grammar defined in Grammar.java uses a parser to parse XML
annotations called XmlAnnotationParser. It is therefore impossible to
regenerate all the class files from the java sources in one go because
the parser for XML annotations needs to be first generated in order
for Grammar.java to be compiled - which introduces a chicken-and-egg
situation.  So we need a bootstrapping process in order to compile the
whole hlt.language.syntax package, this is what must be done:

(1) Configure only Grammar.java so as it will generate a parser that
    does not enable parsing XML annotations - this is feasible because
    the grammar for XML annotations is very simple and does not use
    XML annotations itself (see files in subdir /xml).

    To do so commment out all parts in Grammar.java bracketed between:
    // BEGIN COMMENT OUT FOR NO XML ANNOTATION PARSER
    ...
    // END COMMENT OUT FOR NO XML ANNOTATION PARSER

(2) Recompile Jacc by regenerating the hlt.language.syntax package
    (i.e., do 'make syntax' in this directory's parent directory).

(3) Using this simpler version of Jacc, generate an XmlAnnotationParser
    (i.e., go to  this directory's xml/ subdirectory and do 'make').

(4) Reconfigure Jacc (i.e., Grammar.java) so as it may generate a parser
    that enables parsing XML annotations - i.e., uncomment the commented
    parts above.

For now, we simply indicate the parts in file Grammar.java that need to
be commented out between comments as indicated above.  Ideally, the Make
file should contain a 'make bootstrap' to automate these steps.