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I was wondering what does the xml:base attribute do and what are it's values in XHTML5. and does the xml:base attribute have any restrictions?
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Documentation for the xml:base can be found here. It allows a redefinition of the base address used by relative addresses in child elements.
This is the example for that source,
<?xml version="1.0"?>
<doc xml:base="http://example.org/today/"
xmlns:xlink="http://www.w3.org/1999/xlink">
<head>
<title>Virtual Library</title>
</head>
<body>
<paragraph>See <link xlink:type="simple" xlink:href="new.xml">what's
new</link>!</paragraph>
<paragraph>Check out the hot picks of the day!</paragraph>
<olist xml:base="/hotpicks/">
<item>
<link xlink:type="simple" xlink:href="pick1.xml">Hot Pick #1</link>
</item>
<item>
<link xlink:type="simple" xlink:href="pick2.xml">Hot Pick #2</link>
</item>
<item>
<link xlink:type="simple" xlink:href="pick3.xml">Hot Pick #3</link>
</item>
</olist>
</body>
</doc>
In this case the "What's new" link points to http://example.org/today/new.xml, which is the doc element's xml:base absolute address plus the xlink:href attribute's relative address.
The olist element's xml:base address redefines the base address, using the domain of doc's xml:base but changing the path. So the subsequent links are relative to http://example.org/hotpicks/.
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