Linkspan

Linkspan is a concept used in information systems to denote a contiguous set of hyperlinks that connects a sequence of nodes within a graph representing a collection of pages or documents. The term derives from link and span, emphasizing the extent of navigational connections covered along a path or within a scope.

Defining characteristics vary by context. In its simplest form, a linkspan is the set of directed edges along a path from a source node to a target node in a web graph. In broader usage, it may refer to the union of hyperlinks encountered when traversing pages under constraints such as domain limits, time windows, or topical similarity. A linkspan can be represented by its endpoints and a length or by a list of constituent links.

Applications: In web analytics, linkspan helps quantify navigational reach and link density. In search indexing and recommender systems, understanding linkspan can improve topical clustering and crawl efficiency. In user interface design, measuring linkspan can inform content layout and navigational aids.

Example: On a three-page sequence A -> B -> C, the linkspan from A to C includes the links A-B and B-C, spanning two steps. Dynamic sites with alternate paths may yield multiple possible spans between the same endpoints.

Limitations: The definition of a linkspan is not standardized and may vary across domains. Dynamic pages and non-linear navigation challenge consistent measurement. See also: hyperlink, graph theory, web navigation, PageRank.