an example is a web page listing branch locations of a store chain however it can be the case instead that each spatial identifier is only relevant to a proper subset of the page an example of this is a page giving short reviews of a number of restaurants such a page is a multi part document multi part documents present a problem when searching the document collection by keyword were the document to be keyword indexed as a whole a word in one part of the document would be indexed as though it were relevant to addresses in a different part of the document when in fact the word may not be relevant to that part to detect multi part documents the multiple spatial references partitioner 4262 invokes the multi part cluster measurement 42625 process the multi part cluster measurement 42625 process first rejects any document with fewer than some number of addresses usually 5 or which is shorter than some number of words perhaps 200 the multi part cluster measurement 42625 process computes an array containing the fractional positions of each psi in the page for instance an address that begins at the 200th word in a 1000 word document is at fractional position 0 2 we then apply a clustering statistic such as the gini coefficient to produce a clustering score.