HTML and CSS Reference
In-Depth Information
Defining a Default Namespace
• To define a default namespace for an XML document, add the attribute
<
root
ƒxmlns=”
namespace
”>
to the document's root element, where
root
is the name of the root element and
namespace
is the namespace id for the default namespace.
• To set the default namespace for an XHTML document, add the following
xmlns
attri-
bute to the
html
element:
<htmlƒxmlns=”
http://www.w3.org/1999/xhtml”>
If you don't intend to combine different XML-based languages within the same docu-
ment, it's still a good idea to add a namespace to an XHTML file to explicitly identify the
XML vocabulary in use. In practical terms, though, an XHTML document is still interpre-
table by most browsers without a namespace. Tom would like you to add the XHTML
default namespace to his
works.htm
file.
To add the XHTML namespace:
◗
1.
Locate the opening
<html>
tag in the
works.htm
file.
◗
2.
Within the tag, insert the following attribute, as shown in Figure 9-13:
xmlns=”
http://www.w3.org/1999/xhtml”
figure 9-13
Declaring the XHtML namespace
◗
3.
Save your changes to the file.
