| http://www.w3.org/ns/prov#value | - For example, as shown in FIGS. 27 and 28, search engine 2700 may be configured to maintain trees, tables or other data structures, shown in FIG. 27 as content source/path data structures 2710, that reflect the association of keywords and content sources 310. (As described in greater detail below, in some embodiments keywords may be associated with aggregate paths in addition to or instead of conte
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