In HTML, we know (and all the browsers know!) that the <a> element defines a hyperlink. However, this is not how it works with XML. In XML documents, you can use whatever element names you want - therefore it is impossible for browsers to predict what hyperlink elements will be called in XML documents.
The solution for creating links in XML documents was to put a marker on elements that should act as hyperlinks.
Below is a simple example of how to use XLink to create links in an XML document:
<?xml version="1.0"?>
<homepages xmlns:xlink="http://www.w3.org/1999/xlink">
<homepage xlink:type="simple"
xlink:href="http://www.w3schools.com"> Visit W3Schools</homepage>
<homepage xlink:type="simple"
xlink:href="http://www.w3.org"> Visit W3C</homepage>
</homepages>
To get access to the XLink attributes and features we must declare the XLink namespace at the top of the document.
The XLink namespace is: "http://www.w3.org/1999/xlink".
The xlink:type and the xlink:href attributes in the <homepage> elements define that the type and href attributes come from the xlink namespace.
The xlink:type="simple" creates a simple, two-ended link (means "click from here to go there"). We will look at multi-ended (multidirectional) links later.
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HTML中，由<a>元素定义链接。但是在XML中不是这样。XML中的任何元素都可以是链接起点。这样，做资料的简单，但浏览器并不认识。
针对这一问题的解决方案就是在作为链接起点的元素上作标记。以下就是XML文件中运用XLink来生成链接的示例：
<?xml version="1.0"?>
<homepages xmlns:xlink="http://www.w3.org/1999/xlink">
<homepage xlink:type="simple"
xlink:href="http://www.w3schools.com"> Visit W3Schools</homepage>
<homepage xlink:type="simple"
xlink:href="http://www.w3.org"> Visit W3C</homepage>
</homepages>
要获取XLink属性中的资源，必须在文件中声明XLink的名称空间。以上文件中的XLink名称空间就是："http://www.w3.org/1999/xlink"。
在<homepage>元素中的xlink:type和xlink:href属性都源自xlink名称空间。
xlink:type="simple"所创建的是一个简单链接，即“点击这里就到了那里”的这种点对点连接。多点链接是另一个话题了。
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2007/4/12 9:29:00
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XLink Syntax--XLink语法
