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| <h1>The XML C library for Gnome</h1> |
| <h2>The tree output</h2> |
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| <p>The parser returns a tree built during the document analysis. The value |
| returned is an <strong>xmlDocPtr</strong> (i.e., a pointer to an |
| <strong>xmlDoc</strong> structure). This structure contains information such |
| as the file name, the document type, and a <strong>children</strong> pointer |
| which is the root of the document (or more exactly the first child under the |
| root which is the document). The tree is made of <strong>xmlNode</strong>s, |
| chained in double-linked lists of siblings and with a children<->parent |
| relationship. An xmlNode can also carry properties (a chain of xmlAttr |
| structures). An attribute may have a value which is a list of TEXT or |
| ENTITY_REF nodes.</p> |
| <p>Here is an example (erroneous with respect to the XML spec since there |
| should 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) |
| called <strong>xmllint</strong> which parses XML files given as argument and |
| prints them back as parsed. This is useful for detecting errors both in XML |
| code and in the XML parser itself. It has an option <strong>--debug</strong> |
| which prints the actual in-memory structure of the document; here is the |
| result with the <a href="#example">example</a> given before:</p> |
| <pre>DOCUMENT |
| version=1.0 |
| standalone=true |
| ELEMENT EXAMPLE |
| ATTRIBUTE prop1 |
| TEXT |
| content=gnome is great |
| ATTRIBUTE prop2 |
| ENTITY_REF |
| TEXT |
| content= linux too |
| ELEMENT head |
| ELEMENT title |
| TEXT |
| content=Welcome to Gnome |
| ELEMENT chapter |
| ELEMENT title |
| TEXT |
| content=The Linux adventure |
| ELEMENT p |
| TEXT |
| content=bla bla bla ... |
| ELEMENT image |
| ATTRIBUTE href |
| TEXT |
| content=linus.gif |
| ELEMENT p |
| TEXT |
| content=...</pre> |
| <p>This should be useful for learning the internal representation model.</p> |
| <p><a href="mailto:daniel@veillard.com">Daniel Veillard</a></p> |
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