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Space available for index data is the Oracle block size minus block overhead , entry overhead , rowid , and one length byte for each value indexed . The complete text in the GulfLINK database of recently declassified documents is redundantly indexed with 2 different search engines . Currently there are few forms of statistical analysis specifically designed to handle spatial structure and dependency both within and between spatially indexed multivariate responses , but one such form is sometimes referred to as ` spatial factor analysis ' . The other three are an electronic catalogue - - the core of the library - - that will allow the system to search for requests from users ; an ingest component , which permits librarians and systems managers to incorporate new items into the library collection , and a storage component for large collections of spatially indexed items . We are , as a group , continuing our discussions trying to arrive at a common requirement for dealing with collections of spatially indexed materials . While entries within a feed containing an i : indexed element are required to have i : index elements , a consumer MAY still wish to display indexed feeds whose entries do not contain indexes . By retrieving information from other service providers , service providers can also cascade indexed views from one another - - using the service provider 's query interface to filter or refine the information from one service provider to the next .