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Re: [Help-glpk] A new text-based data format for GLPK

From: Robbie Morrison
Subject: Re: [Help-glpk] A new text-based data format for GLPK
Date: Wed, 06 Jan 2010 21:18:35 +0100
User-agent: Thunderbird (X11/20080306)

Hello GLPK users

For your interest, here are two references on XML and
linear programming in relation to the Opimization
Services project -- mentioned in an earlier post by
Robert Fourer (Sun, 3 Jan 2010 20:32:35 +0300).

Fourer etal (2008) contains a number of examples of XML
for describing (problem) instances, results, and
(solver) options.  These examples are well worth
studying.  GLPK also gets a mention (p22).

Personally I don't use an external LP data-model in my
project, so I can't comment on the appropriateness of
the Optimization Services initiative (instead I work
internally with the GLPK APIs).  That said, either
structured-text or XML export (if developed for GLPK)
will doubtless be available as a library function and
could well prove useful when debugging host applications.

with best wishes, Robbie


    Fourer, Robert, Horand Gassmann, Jun Ma, Kipp Martin,
      and Wayne Sheng
    Optimization Services 1.0 user's manual
    March 24, 2008

    file: osUsersManual_1.pdf

    Abstract: This is the User's Manual for the Optimization
    Services (OS) project.  The objective of (OS) is to
    provide a general framework consisting of a set of
    standards for representing optimization instances,
    results, solver options, and communication between
    clients and solvers in a distributed environment using
    Web Services.  This COIN-OR project provides C++ and
    Java source code for libraries and executable programs
    that implement OS standards.  The OS library includes a
    robust solver and modeling language interface (API) for
    linear, nonlinear and other types of optimization
    problems.  Also included is the C++ source code for a
    command line executable 'OSSolverService' for reading
    problem instances (OSiL format, nl format, MPS format)
    and calling a solver either locally or on a remote
    server.  Finally, both Java source code and a Java 'war'
    file are provided for users who wish to set up a solver
    service on a server running Apache Tomcat.  See the
    Optimization Services (OS) home page
    '' and the COIN-OR Trac page
    '' for more information.


    Fourer, Robert, L Lopes, and Kipp Martin
    LPFML : a W3C XML schema for linear and integer programming
    INFORMS Journal on Computing
    17:139- 158

Robbie Morrison
PhD student -- policy-oriented energy system simulation
Technical University of Berlin (TU-Berlin), Germany
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