| Daniel Veillard | ccb0963 | 1998-10-27 06:21:04 +0000 | [diff] [blame^] | 1 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" |
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| 3 | <html> |
| 4 | <head> |
| 5 | <title>No title</title> |
| 6 | <meta name="GENERATOR" content="amaya V1.3b"> |
| 7 | </head> |
| 8 | <body bgcolor="#ffffff"> |
| 9 | |
| 10 | <h1 align="center">The XML library for Gnome</h1> |
| 11 | <p> |
| 12 | This document describes the <a href="http://www.w3.org/XML/">XML</a> library |
| 13 | provideed in the <a href="http://www.gnome.org/">Gnome</a> framework. XML is a |
| 14 | standard to build tag based structured documents. The internal document |
| 15 | repesentation is as close as possible to the <a |
| 16 | href="http://www.w3.org/DOM/">DOM</a> interfaces.</p> |
| 17 | |
| 18 | <h2>xml</h2> |
| 19 | <p> |
| 20 | XML is a standard for markup based structured documents, here is an |
| 21 | example:</p> |
| 22 | <pre><?xml version="1.0"?> |
| 23 | <EXAMPLE prop1="gnome is great" prop2="&linux; too"> |
| 24 | <head> |
| 25 | <title>Welcome to Gnome</title> |
| 26 | </head> |
| 27 | <chapter> |
| 28 | <title>The Linux adventure</title> |
| 29 | <p>bla bla bla ...</p> |
| 30 | <image href="linus.gif"/> |
| 31 | <p>...</p> |
| 32 | </chapter> |
| 33 | </EXAMPLE></pre> |
| 34 | <p> |
| 35 | </p> |
| 36 | |
| 37 | <h2>Invoking the parser</h2> |
| 38 | |
| 39 | <h2>The tree output</h2> |
| 40 | <p> |
| 41 | The parser returns a tree built during the document analysis. The value |
| 42 | returned is an <strong>xmlDocPtr</strong> (i.e. a pointer to an |
| 43 | <strong>xmlDoc</strong> structure). This structure contains informations like |
| 44 | the file name, the document type, and a <strong>root</strong> pointer which |
| 45 | is the root of the document (or more exactly the first child under the root |
| 46 | which is the document). The tree is made of <strong>xmlNode</strong>s, chained |
| 47 | in double linked lists of siblings and with childs<->parent relationship. |
| 48 | An xmlNode can also carry properties (a chain of xmlAttr structures). An |
| 49 | attribute may have a value which is a list of TEXT or ENTITY_REF nodes.</p> |
| 50 | <p> |
| 51 | Here is an example (erroneous w.r.t. the XML spec since there should be only |
| 52 | one ELEMENT under the root):</p> |
| 53 | <p> |
| 54 | <img src="structure.gif" alt=" structure.gif "></p> |
| 55 | <p> |
| 56 | </p> |
| 57 | |
| 58 | <h2>Modifying the tree</h2> |
| 59 | |
| 60 | <h2>Saving a tree</h2> |
| 61 | |
| 62 | <h2>DOM interfaces</h2> |
| 63 | <p> |
| 64 | <a href="http://www.w3.org/DOM/">DOM</a> stands for the <em>Document Object |
| 65 | Model</em> this is an API for accessing XML or HTML structured documents. |
| 66 | Native support for DOM in Gnome is on the way (module gnome-dom), and it will |
| 67 | be based on gnome-xml. DOM defiles a set of IDL (or Java) interfaces allowing |
| 68 | to traverse and manipulate a document. The DOM library will allow accessing |
| 69 | and modifying "live" documents presents on other programs like this:</p> |
| 70 | <p> |
| 71 | <img src="DOM.gif" alt=" DOM.gif "></p> |
| 72 | <p> |
| 73 | This should help greatly doing things like modifying a gnumeric spreadsheet |
| 74 | embedded in a GWP document for example.</p> |
| 75 | <p> |
| 76 | </p> |
| 77 | </body> |
| 78 | </html> |