Daniel Veillard | 43d3f61 | 2001-11-10 11:57:23 +0000 | [diff] [blame] | 1 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd"> |
Daniel Veillard | c948420 | 2001-10-24 12:35:52 +0000 | [diff] [blame] | 2 | <html> |
| 3 | <head> |
| 4 | <meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"> |
| 5 | <style type="text/css"><!-- |
Daniel Veillard | 2c748c6 | 2002-01-16 15:37:50 +0000 | [diff] [blame] | 6 | TD {font-size: 14pt; font-family: Verdana,Arial,Helvetica} |
| 7 | BODY {font-size: 14pt; font-family: Verdana,Arial,Helvetica; margin-top: 2em; margin-left: 0em; margin-right: 0em} |
| 8 | H1 {font-size: 20pt; font-family: Verdana,Arial,Helvetica} |
| 9 | H2 {font-size: 18pt; font-family: Verdana,Arial,Helvetica} |
| 10 | H3 {font-size: 16pt; font-family: Verdana,Arial,Helvetica} |
Daniel Veillard | b8cfbd1 | 2001-10-25 10:53:28 +0000 | [diff] [blame] | 11 | A:link, A:visited, A:active { text-decoration: underline } |
Daniel Veillard | c948420 | 2001-10-24 12:35:52 +0000 | [diff] [blame] | 12 | --></style> |
| 13 | <title>The SAX interface</title> |
| 14 | </head> |
| 15 | <body bgcolor="#8b7765" text="#000000" link="#000000" vlink="#000000"> |
| 16 | <table border="0" width="100%" cellpadding="5" cellspacing="0" align="center"><tr> |
| 17 | <td width="180"> |
| 18 | <a href="http://www.gnome.org/"><img src="smallfootonly.gif" alt="Gnome Logo"></a><a href="http://www.w3.org/Status"><img src="w3c.png" alt="W3C Logo"></a><a href="http://www.redhat.com/"><img src="redhat.gif" alt="Red Hat Logo"></a> |
| 19 | </td> |
| 20 | <td><table border="0" width="90%" cellpadding="2" cellspacing="0" align="center" bgcolor="#000000"><tr><td><table width="100%" border="0" cellspacing="1" cellpadding="3" bgcolor="#fffacd"><tr><td align="center"> |
| 21 | <h1>The XML C library for Gnome</h1> |
| 22 | <h2>The SAX interface</h2> |
| 23 | </td></tr></table></td></tr></table></td> |
| 24 | </tr></table> |
| 25 | <table border="0" cellpadding="4" cellspacing="0" width="100%" align="center"><tr><td bgcolor="#8b7765"><table border="0" cellspacing="0" cellpadding="2" width="100%"><tr> |
Daniel Veillard | 594cf0b | 2001-10-25 08:09:12 +0000 | [diff] [blame] | 26 | <td valign="top" width="200" bgcolor="#8b7765"><table border="0" cellspacing="0" cellpadding="1" width="100%" bgcolor="#000000"><tr><td> |
| 27 | <table width="100%" border="0" cellspacing="1" cellpadding="3"> |
Daniel Veillard | c948420 | 2001-10-24 12:35:52 +0000 | [diff] [blame] | 28 | <tr><td colspan="1" bgcolor="#eecfa1" align="center"><center><b>Main Menu</b></center></td></tr> |
Daniel Veillard | 8acca11 | 2002-01-21 09:52:27 +0000 | [diff] [blame^] | 29 | <tr><td bgcolor="#fffacd"><ul> |
Daniel Veillard | c948420 | 2001-10-24 12:35:52 +0000 | [diff] [blame] | 30 | <li><a href="index.html">Home</a></li> |
Daniel Veillard | c948420 | 2001-10-24 12:35:52 +0000 | [diff] [blame] | 31 | <li><a href="intro.html">Introduction</a></li> |
Daniel Veillard | b8cfbd1 | 2001-10-25 10:53:28 +0000 | [diff] [blame] | 32 | <li><a href="FAQ.html">FAQ</a></li> |
Daniel Veillard | c948420 | 2001-10-24 12:35:52 +0000 | [diff] [blame] | 33 | <li><a href="docs.html">Documentation</a></li> |
| 34 | <li><a href="bugs.html">Reporting bugs and getting help</a></li> |
| 35 | <li><a href="help.html">How to help</a></li> |
| 36 | <li><a href="downloads.html">Downloads</a></li> |
| 37 | <li><a href="news.html">News</a></li> |
Daniel Veillard | 7b602b4 | 2002-01-08 13:26:00 +0000 | [diff] [blame] | 38 | <li><a href="XMLinfo.html">XML</a></li> |
Daniel Veillard | c948420 | 2001-10-24 12:35:52 +0000 | [diff] [blame] | 39 | <li><a href="XSLT.html">XSLT</a></li> |
Daniel Veillard | b8cfbd1 | 2001-10-25 10:53:28 +0000 | [diff] [blame] | 40 | <li><a href="architecture.html">libxml architecture</a></li> |
Daniel Veillard | c948420 | 2001-10-24 12:35:52 +0000 | [diff] [blame] | 41 | <li><a href="tree.html">The tree output</a></li> |
| 42 | <li><a href="interface.html">The SAX interface</a></li> |
Daniel Veillard | b8cfbd1 | 2001-10-25 10:53:28 +0000 | [diff] [blame] | 43 | <li><a href="xmldtd.html">Validation & DTDs</a></li> |
| 44 | <li><a href="xmlmem.html">Memory Management</a></li> |
| 45 | <li><a href="encoding.html">Encodings support</a></li> |
| 46 | <li><a href="xmlio.html">I/O Interfaces</a></li> |
| 47 | <li><a href="catalog.html">Catalog support</a></li> |
| 48 | <li><a href="library.html">The parser interfaces</a></li> |
Daniel Veillard | c948420 | 2001-10-24 12:35:52 +0000 | [diff] [blame] | 49 | <li><a href="entities.html">Entities or no entities</a></li> |
| 50 | <li><a href="namespaces.html">Namespaces</a></li> |
Daniel Veillard | b8cfbd1 | 2001-10-25 10:53:28 +0000 | [diff] [blame] | 51 | <li><a href="upgrade.html">Upgrading 1.x code</a></li> |
Daniel Veillard | 52dcab3 | 2001-10-30 12:51:17 +0000 | [diff] [blame] | 52 | <li><a href="threads.html">Thread safety</a></li> |
Daniel Veillard | c948420 | 2001-10-24 12:35:52 +0000 | [diff] [blame] | 53 | <li><a href="DOM.html">DOM Principles</a></li> |
| 54 | <li><a href="example.html">A real example</a></li> |
| 55 | <li><a href="contribs.html">Contributions</a></li> |
Daniel Veillard | 594cf0b | 2001-10-25 08:09:12 +0000 | [diff] [blame] | 56 | <li> |
| 57 | <a href="xml.html">flat page</a>, <a href="site.xsl">stylesheet</a> |
| 58 | </li> |
Daniel Veillard | c948420 | 2001-10-24 12:35:52 +0000 | [diff] [blame] | 59 | </ul></td></tr> |
Daniel Veillard | 594cf0b | 2001-10-25 08:09:12 +0000 | [diff] [blame] | 60 | </table> |
| 61 | <table width="100%" border="0" cellspacing="1" cellpadding="3"> |
| 62 | <tr><td colspan="1" bgcolor="#eecfa1" align="center"><center><b>Related links</b></center></td></tr> |
Daniel Veillard | 8acca11 | 2002-01-21 09:52:27 +0000 | [diff] [blame^] | 63 | <tr><td bgcolor="#fffacd"><ul> |
Daniel Veillard | 594cf0b | 2001-10-25 08:09:12 +0000 | [diff] [blame] | 64 | <li><a href="http://mail.gnome.org/archives/xml/">Mail archive</a></li> |
| 65 | <li><a href="http://xmlsoft.org/XSLT/">XSLT libxslt</a></li> |
Daniel Veillard | 4a85920 | 2002-01-08 11:49:22 +0000 | [diff] [blame] | 66 | <li><a href="http://phd.cs.unibo.it/gdome2/">DOM gdome2</a></li> |
Daniel Veillard | 594cf0b | 2001-10-25 08:09:12 +0000 | [diff] [blame] | 67 | <li><a href="ftp://xmlsoft.org/">FTP</a></li> |
| 68 | <li><a href="http://www.fh-frankfurt.de/~igor/projects/libxml/">Windows binaries</a></li> |
Daniel Veillard | db9dfd9 | 2001-11-26 17:25:02 +0000 | [diff] [blame] | 69 | <li><a href="http://garypennington.net/libxml2/">Solaris binaries</a></li> |
Daniel Veillard | c6271d2 | 2001-10-27 07:50:58 +0000 | [diff] [blame] | 70 | <li><a href="http://bugzilla.gnome.org/buglist.cgi?product=libxml">Bug Tracker</a></li> |
Daniel Veillard | 594cf0b | 2001-10-25 08:09:12 +0000 | [diff] [blame] | 71 | </ul></td></tr> |
| 72 | </table> |
| 73 | </td></tr></table></td> |
Daniel Veillard | c948420 | 2001-10-24 12:35:52 +0000 | [diff] [blame] | 74 | <td valign="top" bgcolor="#8b7765"><table border="0" cellspacing="0" cellpadding="1" width="100%"><tr><td><table border="0" cellspacing="0" cellpadding="1" width="100%" bgcolor="#000000"><tr><td><table border="0" cellpadding="3" cellspacing="1" width="100%"><tr><td bgcolor="#fffacd"> |
| 75 | <p>Sometimes the DOM tree output is just too large to fit reasonably into |
| 76 | memory. In that case (and if you don't expect to save back the XML document |
| 77 | loaded using libxml), it's better to use the SAX interface of libxml. SAX is |
| 78 | a <strong>callback-based interface</strong> to the parser. Before parsing, |
| 79 | the application layer registers a customized set of callbacks which are |
| 80 | called by the library as it progresses through the XML input.</p> |
| 81 | <p>To get more detailed step-by-step guidance on using the SAX interface of |
| 82 | libxml, see the <a href="http://www.daa.com.au/~james/gnome/xml-sax/xml-sax.html">nice |
| 83 | documentation</a>.written by <a href="mailto:james@daa.com.au">James |
| 84 | Henstridge</a>.</p> |
| 85 | <p>You can debug the SAX behaviour by using the <strong>testSAX</strong> |
| 86 | program located in the gnome-xml module (it's usually not shipped in the |
| 87 | binary packages of libxml, but you can find it in the tar source |
| 88 | distribution). Here is the sequence of callbacks that would be reported by |
| 89 | testSAX when parsing the example XML document shown earlier:</p> |
| 90 | <pre>SAX.setDocumentLocator() |
| 91 | SAX.startDocument() |
| 92 | SAX.getEntity(amp) |
| 93 | SAX.startElement(EXAMPLE, prop1='gnome is great', prop2='&amp; linux too') |
| 94 | SAX.characters( , 3) |
| 95 | SAX.startElement(head) |
| 96 | SAX.characters( , 4) |
| 97 | SAX.startElement(title) |
| 98 | SAX.characters(Welcome to Gnome, 16) |
| 99 | SAX.endElement(title) |
| 100 | SAX.characters( , 3) |
| 101 | SAX.endElement(head) |
| 102 | SAX.characters( , 3) |
| 103 | SAX.startElement(chapter) |
| 104 | SAX.characters( , 4) |
| 105 | SAX.startElement(title) |
| 106 | SAX.characters(The Linux adventure, 19) |
| 107 | SAX.endElement(title) |
| 108 | SAX.characters( , 4) |
| 109 | SAX.startElement(p) |
| 110 | SAX.characters(bla bla bla ..., 15) |
| 111 | SAX.endElement(p) |
| 112 | SAX.characters( , 4) |
| 113 | SAX.startElement(image, href='linus.gif') |
| 114 | SAX.endElement(image) |
| 115 | SAX.characters( , 4) |
| 116 | SAX.startElement(p) |
| 117 | SAX.characters(..., 3) |
| 118 | SAX.endElement(p) |
| 119 | SAX.characters( , 3) |
| 120 | SAX.endElement(chapter) |
| 121 | SAX.characters( , 1) |
| 122 | SAX.endElement(EXAMPLE) |
| 123 | SAX.endDocument()</pre> |
| 124 | <p>Most of the other interfaces of libxml are based on the DOM tree-building |
| 125 | facility, so nearly everything up to the end of this document presupposes the |
| 126 | use of the standard DOM tree build. Note that the DOM tree itself is built by |
| 127 | a set of registered default callbacks, without internal specific |
| 128 | interface.</p> |
| 129 | <p><a href="mailto:daniel@veillard.com">Daniel Veillard</a></p> |
| 130 | </td></tr></table></td></tr></table></td></tr></table></td> |
| 131 | </tr></table></td></tr></table> |
| 132 | </body> |
| 133 | </html> |