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   6           cxml-rng: Relax NG for Closure XML
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  14             —
  15             <b> Relax NG for Closure XML</b>
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  19   <p>
  20     An implementation
  21     of <a href="http://relaxng.org/spec-20011203.html">Relax
  22       NG</a> schema validation
  23     written in Common Lisp.
  24   </p>
  25   <p>
  26     cxml-rng was written
  27     by <a href="mailto:david@lichteblau.com">David
  28       Lichteblau</a> and is designed as an add-on library for
  29     <a href="http://common-lisp.net/project/cxml">Closure XML</a>.
  30     It is available under an X11-style license.
  31   </p>
  32   <p>
  33     Please send bug reports
  34     to <a href="mailto:cxml-devel@common-lisp.net">
  35       cxml-devel@common-lisp.net</a>
  36     (<a href="http://common-lisp.net/cgi-bin/mailman/listinfo/cxml-devel">list information</a>).
  37   </p>
  38
  39   <h3>Download and Installation</h3>
  40
  41   <p>
  42     Download
  43     cxml-rng <a href="http://www.lichteblau.com/cxml-rng/download/">tarballs</a>
  44     or get it from
  45     git: <tt>http://www.lichteblau.com/git/cxml-rng.git</tt>
  46   </p>
  47   <p>
  48     cxml-rng
  49     needs <a href="http://common-lisp.net/project/cxml">Closure
  50       XML</a> and <a href="http://weitz.de/cl-ppcre/">CL-PPCE</a>.
  51     <a href="http://www.cliki.net/asdf">ASDF</a> is used for
  52     compilation.  Register the .asd file, e.g. by symlinking it,
  53     then compile cxml-rng using <tt>asdf:operate</tt>.
  54   </p>
  55   <pre>$ ln -sf `pwd`/cxml-rng.asd /path/to/your/registry/
  56 * (asdf:operate 'asdf:load-op :cxml-rng)</pre>
  57
  58   <h3>Implementation-specific notes</h3>
  59   <p>
  60     At this point, cxml-rng is written to work with Lisp strings
  61     (as opposed to runes and rods), and is meant to be used on
  62     Lisp implementations with Unicode support.
  63   </p>
  64
  65   <h3>Example</h3>
  66   <p>
  67     Use <a href="doc/pages/cxml-rng__parse-schema.html">cxml-rng:parse-schema</a>
  68     to parse a Relax NG schema file.  The
  69     resulting <a href="doc/pages/cxml-rng__schema.html">schema</a>
  70     object is a representation of a simplified schema using Lisp
  71     objects, which has gone through most stages of simplification as
  72     described the Relax NG
  73     specification.  <a href="doc/pages/cxml-rng__serialize-grammar.html">cxml-rng:serialize-grammar</a>
  74     can be used to write a Relax NG file in XML syntax for this
  75     grammar.
  76   </p>
  77   <p>
  78     In order to validate XML against a schema, create a
  79     validation handler for the grammar
  80     using <a href="doc/pages/cxml-rng__make-validator.html">cxml-rng:make-validator</a>.
  81     The validation
  82     handler processes SAX events and can be used with any
  83     function generating such events, in particular
  84     with <a href="http://common-lisp.net/project/cxml/sax.html#parser">cxml:parse-file</a>.
  85   </p>
  86   <pre class="code">(cxml:parse-file "example.xml"
  87                  <span style="color: black">(cxml-rng:make-validator
  88                   (cxml-rng:parse-schema #p"example.rng"))</span>)</pre>
  89   <p>
  90     In order to validate while also processing events with
  91     another handler, use a broadcast handler.  For example, to
  92     parse XML into DOM while also validating it, broadcast to
  93     the validator and DOM builder (in that order):
  94   </p>
  95   <pre class="code" style="color: #777777">(cxml:parse-file "example.xml"
  96                  <span style="color: black">(cxml:make-broadcast-handler</span>
  97                   (cxml-rng:make-validator
  98                    (cxml-rng:parse-schema #p"example.rng"))
  99                   <span style="color: black">(cxml-dom:make-dom-builder))</span>)</pre>
 100   <p>
 101     To validate with the klacks parser, use a tapping source.
 102   </p>
 103   <pre class="code" style="color: #777777">(klacks:with-open-source
 104     (s <span style="color: black">(klacks:make-tapping-source</span>
 105         (cxml:make-source #p"example.xml")
 106         <span style="color: black">(cxml-rng:make-validator
 107          (cxml-rng:parse-schema #p"example.rng"))</span>))
 108   (loop for key = (klacks:peek-next s) while key do (print key)))</pre>
 109
 110   <h3>Documentation</h3>
 111   <p>
 112     <a href="doc/index.html">API documentation</a> is available.
 113   </p>
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