September 2004
Intermediate to advanced
712 pages
24h 45m
English
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Arcs
Paths between resources are called
arcs, and they are represented by arc
elements; that is, elements of arbitrary type that
have an xlink:type attribute with the value arc. Each arc element should have an
xlink:from attribute and an xlink:to attribute. The xlink:from attribute identifies the source
of the link. The xlink:to
attribute identifies the target of the link. These attributes do not
contain URIs as you might expect. Rather they contain a name
matching the value of the xlink:label attribute of one of the
locator elements in the extended link.
Example 10-1 shows
an extended link that contains the first three novels in the Wizard
of Oz series: The Wonderful Wizard of Oz,
The Marvelous Land of Oz, and Ozma of
Oz. Arcs connect the first book in the series to the
second and the second to the third, and then back again. In this
example, the root series element
is the extended link element, each novel element is a locator element, and
the next and previous elements are arc elements.
Example 10-1. An extended link with three locators and four arcs
<series xlink:type="extended" xmlns:xlink="http://www.w3.org/1999/xlink"> <author>L. Frank Baum</author> <!-- locator elements --> <novel xlink:type="locator" xlink:label="oz1" xlink:href="ftp://archive.org/pub/etext/etext93/wizoz10.txt"> <title>The Wonderful Wizard of Oz</title> <year>1900</year> </novel> <novel xlink:type="locator" xlink:label="oz2" xlink:href="ftp://archive.org/pub/etext/etext93/ozland10.txt"> <title>The Marvelous ...