XML is a
standardformarkup-based structured documents. Here is an example XMLdocument: <?xml version="1.0"?>
<EXAMPLE prop1="gnome is great" prop2="& linux too">
<head>
<title>Welcome to Gnome</title>
</head>
<chapter>
<title>The Linux adventure</title>
<p>bla bla bla ...</p>
<image href="linus.gif"/>
<p>...</p>
</chapter>
</EXAMPLE> The first line specifies that it is an XML document and gives
usefulinformation about its encoding. Then the rest of the document is a
textformat whose structure is specified by tags between brackets.
Eachtag opened has to be closed. XML is pedantic about this.
However, ifa tag is empty (no content), a single tag can serve as both the
opening andclosing tag if it ends with /> rather than
with> . Note that, for example, the image tag has no content
(justan attribute) and is closed by ending the tag with
/> . XML can be applied successfully to a wide range of tasks, ranging fromlong
term structured document maintenance (where it follows the steps ofSGML) to
simple data encoding mechanisms like configuration file formatting(glade),
spreadsheets (gnumeric), or even shorter lived documents such asWebDAV where
it is used to encode remote calls between a client and aserver. Daniel Veillard |