I have a large pop-11 program, with a NLP system written in prolog. I
wanted to use pop-11 as the base language, but I am having problems
intergrating the two languages. Basically what I'm after are methods for:

* Calling prolog procedures (i.e. calling foo(Arg1, Arg2). from pop-11)
* Reading prolog variables (i.e. the result of the foo(Arg1, Arg2). )
* Intergrating the two languages in a single file - how do I make pop-11
realise that I am writing prolog as well as pop-11?

If anyone has examples of how to do these things I would be very grateful.

David Reece

---------------------------------------------------
This message is intended only for the use of the person(s) ("the intended
recipient(s)") to whom it is addressed. It may contain information which
is privileged and confidential within the meaning of applicable law. If
you are not the intended recipient, please contact the sender as soon as
possible. The views and opinions expressed in this communication are the
sender's own and do not necessarily represent the views and opinions held
by the University of Birmingham.

    PROLOG HELP MIXED_LANGUAGES
        In Ved, if running prolog do
            ENTER help mixed_languages
        otherwise:
            ENTER prolog help mixed_languages
        which can be shortened to
            ENTER ploghelp mixed_languages
This tells you about

        (a)    prolog_newvar() -> <prologvar>
               (See PLOGHELP * TERMSINPOP)

        (b)    prolog_maketerm({<word|list|prologterm>}*, <word>, <integer>)
                                                            -> <prologterm>
               (See PLOGHELP * TERMSINPOP)

        (c)    prolog_deref(<prologvar:V>) -> <term>
               (See PLOGHELP * TERMSINPOP)

        (d)    prolog_full_deref(<prologvar:V>) -> <term:T>
               (See PLOGHELP * PROLOG_DEREF)

        (e)    prolog_invoke(<prolog_term>) -> <boolean>
               (See PLOGHELP * PROLOG_INVOKE)

    The file includes some examples.

See also
    HELP PLOGINPOP
    PLOGHELP PLOGTOPOP

    $usepop/pop/plog/lib/tracer.pl

It illustrates the use of these two constructs to switch between
prolog and pop-11 in the same file:

:- prolog_language("pop11").
        Switch from Prolog to Pop-11

:- prolog_language("prolog").
        Switch from Pop-11 to Prolog.

There is more information in online documentation.

Aaron
====
Aaron Sloman, ( http://www.cs.bham.ac.uk/~axs/ )
School of Computer Science, The University of Birmingham, B15 2TT, UK

PAPERS: http://www.cs.bham.ac.uk/research/cogaff/
FREE TOOLS: http://www.cs.bham.ac.uk/research/poplog/freepoplog.html