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26 The XML Files: Development of XML/XSL Applications Using WebSphere Studio
Locator: Pointer to a external source. A locator can have a title as its child
element type.
Arc: A rule between resources. An arc element can have a title as its child
element type.
The
simple and extended attributes are considered as linking elements. The other
attributes describe the link. A
resource is any available information or service that
can be located by one means or another. The links, therefore, can link any two
resources: files, documents, images, query results, and programs. A resource
can refer to a portion of a resource, and may not have to refer to the whole file or
document. A local resource is specified
by value and a remote resource is
specified
by reference.
A
transversal is a path from one resource to another. An arc describes the
traversal and application behavior between two resources. A link is
multi-directional if is coded such that the resources switch places at the starting
and ending resources. This is not the same as
going back on the link. An arc is
out-bound if the starting resources is local and the ending resource is remote. An
example would be the HTML
A element. Conversely, if the ending resource is
local, but the starting resource was remote, the arc is said to be
in-bound. A
remote resource is one, which we do not have write access to or one we cannot
embed linking constructs.
The arc is said to be
third-party if both the starting and ending resource are
remote. Typically, at any one time, the arc is in-bound, out-bound, or third-party.
Files or documents that contain a collection of in-bound and third-party links are
called linkups or link databases.
An example of a simple link is found in Example 2-3.
Example 2-3 A simple link
<passengers:FlightReference
xlink:href="passengerList.xml"
xlink:role="http://www.airline.com/linkproperties/passengerlist"
xlink:title="Passenger List">
xlink:show="replace"
xlink:actuate="onRequest">
List of Students for the Flight
</passengers:FlightReference>
A simple link in its simplest form provides an outbound link for two resources.
This would be very similar to the HTML-style A and IMG links. A click (for the