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xxexpr.ss - an SXML-to-XML converter

The SSAX XML parsing- and processing-library provides robust, high-quality XML reading tools for Scheme, but doesn’t include a general purpose XML writer. Over the past couple of years, a few of my projects have had a need to convert SXML-like data to an XML 1.0 external representation, and so I’ve written a portable SXML-to-XML printing library. The library has been used with Chicken, MzScheme, SISC, and Scheme48 to date.

The library is parameterized over a choice of double- or single-quotes for attribute printing, and can, if required, be instructed to use explicit close-tags when an empty-tag is encountered. It provides procedures for producing a string representation of an XML fragment, for printing an XML fragment directly to a port, and for pretty-printing an XML fragment with indentation. For example,

(pretty-print-xxexpr
 (let ((title "My Page"))
   (list
    '(*pi* xml (version "1.0"))
    `(html (head (title ,title))
           (body (h1 ,title)
                 (p "Hello, world!"))))))

produces the following output:

<?xml version='1.0'?>
<html>
    <head>
        <title>My Page</title>
    </head>
    <body>
        <h1>My Page</h1>
        <p>Hello, world!</p>
    </body>
</html>

The code is available on github, at https://github.com/tonyg/xxexpr/.

Licensing

Copyright (C) 2004,2005,2011 by Tony Garnock-Jones.

This is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.

This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this software; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

Author: Tony Garnock-Jones tonygarnockjones@gmail.com

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A library for writing or pretty-printing SXML-encoded XML

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