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All, Thanks for the help with my question on searching, I am now the proud owner of a copy of fgrep and the dbxml source which makes for great bedtime reading ;). Having looked into things in more details I see that more than just searching through documents for instances of specific text strings I would like to index documents with keywords. More than that the keywords need to be hierarchical and the indexes importable/exportable between systems. For example: Suppose I have a large number of cooking recipes in the form of XML documents (it makes a change form the ubiquitous 'customer orders' example :)) and I want to categorise them according to place of origin. This would allow a user to search for all Italian recipes or all British recipes. A particular user may be a bit of a connoissuer and wants to be more specific with his indexing so he adds catagories for Naples, Rome and Sicily. He can now search for Neopolitan recipes specifically but if he searches on Italy the Naples recipes will still be found (i.e the categories/keywords are hierarchical). Furthermore his friend wants borrow his recipe for Neopolitan ice- cream (bad example but I can't think of any other Neopolitan dishes!) but he doesn't have the category/keyword for Naples so the indexing information needs to be exported as well. Another possibility is that the friend doesn't have the keyword Naples but does have the keyword/category Southern Italy so there is a question about merging user-defined categories (although I see this as requiring user-input). There are a number of issues here, including whether to store the indexing information with the document or in a separate file (and recombine them for exporting) and whether to use single or multiple elements to implement the 'hierarchical' indexing scheme. Any tips/hints/ideas/resources/etc for implementation schemes will be gratefully received. Many thanks, Phil Ruelle
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