Arcs
An extended link can group a set of related resources, and allow links to be made from each resource to all other resources in the group. Yet this degree of freedom is not always desirable. Some resources may not be suitable starting points, and others may be equally unsuitable as target resources from some of the starting points. The ' arc' concept provides a means for specific traversal options to be specified between resources in the group.
Arc-type elements
An arc-type element, identified by the Type attribute value 'arc', has From and To attributes to identify the starting point (or points) and ending point (or points) of a possible traversal between participating resources. But these two attributes must refer to the starting point ...
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