1<?xml version="1.0" encoding="UTF-8"?> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 3<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><link rel="SHORTCUT ICON" href="/favicon.ico" /><style type="text/css"> 4TD {font-family: Verdana,Arial,Helvetica} 5BODY {font-family: Verdana,Arial,Helvetica; margin-top: 2em; margin-left: 0em; margin-right: 0em} 6H1 {font-family: Verdana,Arial,Helvetica} 7H2 {font-family: Verdana,Arial,Helvetica} 8H3 {font-family: Verdana,Arial,Helvetica} 9A:link, A:visited, A:active { text-decoration: underline } 10</style><title>The tree output</title></head><body bgcolor="#8b7765" text="#000000" link="#a06060" vlink="#000000"><table border="0" width="100%" cellpadding="5" cellspacing="0" align="center"><tr><td width="120"><a href="http://swpat.ffii.org/"><img src="epatents.png" alt="Action against software patents" /></a></td><td width="180"><a href="http://www.gnome.org/"><img src="gnome2.png" alt="Gnome2 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><div align="left"><a href="http://xmlsoft.org/"><img src="Libxml2-Logo-180x168.gif" alt="Made with Libxml2 Logo" /></a></div></td><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"><h1>The XML C parser and toolkit of Gnome</h1><h2>The tree output</h2></td></tr></table></td></tr></table></td></tr></table><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><td valign="top" width="200" bgcolor="#8b7765"><table border="0" cellspacing="0" cellpadding="1" 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href="http://cpan.uwinnipeg.ca/dist/XML-LibXML">Perl bindings</a></li><li><a href="http://libxmlplusplus.sourceforge.net/">C++ bindings</a></li><li><a href="http://www.zend.com/php5/articles/php5-xmlphp.php#Heading4">PHP bindings</a></li><li><a href="http://sourceforge.net/projects/libxml2-pas/">Pascal bindings</a></li><li><a href="http://libxml.rubyforge.org/">Ruby bindings</a></li><li><a href="http://tclxml.sourceforge.net/">Tcl bindings</a></li><li><a href="https://gitlab.gnome.org/GNOME/libxml2/issues">Bug Tracker</a></li></ul></td></tr></table></td></tr></table></td><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"><p>The parser returns a tree built during the document analysis. The value 11returned is an <strong>xmlDocPtr</strong> (i.e., a pointer to an 12<strong>xmlDoc</strong> structure). This structure contains information such 13as the file name, the document type, and a <strong>children</strong> pointer 14which is the root of the document (or more exactly the first child under the 15root which is the document). The tree is made of <strong>xmlNode</strong>s, 16chained in double-linked lists of siblings and with a children<->parent 17relationship. An xmlNode can also carry properties (a chain of xmlAttr 18structures). An attribute may have a value which is a list of TEXT or 19ENTITY_REF nodes.</p><p>Here is an example (erroneous with respect to the XML spec since there 20should be only one ELEMENT under the root):</p><p><img src="structure.gif" alt=" structure.gif " /></p><p>In the source package there is a small program (not installed by default) 21called <strong>xmllint</strong> which parses XML files given as argument and 22prints them back as parsed. This is useful for detecting errors both in XML 23code and in the XML parser itself. It has an option <strong>--debug</strong> 24which prints the actual in-memory structure of the document; here is the 25result with the <a href="#example">example</a> given before:</p><pre>DOCUMENT 26version=1.0 27standalone=true 28 ELEMENT EXAMPLE 29 ATTRIBUTE prop1 30 TEXT 31 content=gnome is great 32 ATTRIBUTE prop2 33 ENTITY_REF 34 TEXT 35 content= linux too 36 ELEMENT head 37 ELEMENT title 38 TEXT 39 content=Welcome to Gnome 40 ELEMENT chapter 41 ELEMENT title 42 TEXT 43 content=The Linux adventure 44 ELEMENT p 45 TEXT 46 content=bla bla bla ... 47 ELEMENT image 48 ATTRIBUTE href 49 TEXT 50 content=linus.gif 51 ELEMENT p 52 TEXT 53 content=...</pre><p>This should be useful for learning the internal representation model.</p><p><a href="bugs.html">Daniel Veillard</a></p></td></tr></table></td></tr></table></td></tr></table></td></tr></table></td></tr></table></body></html> 54
