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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: indexing and querying XML (not XQuery)
 That's an implementation issue for searching the docs. I have to look at Lucene. I assumed you meant loading the schema itself. This is the tricky bit: if the schema is not really informative about the content of text nodes, you have to use full-text searching and that is a very large job for any sizable collection. deRose is the expert on this topic though. I'm referring to a system that loads the Schema(s) in order to create a search GUI, then let's you save the search criteria. Ad hoc search requirements for relational systems do this. Typical implementations scour the table objects, get the table and field names, then load the GUI with those. An application specific version of that preloads those and might attach conditions based on other rules such as security, need to know, role-based stuff, etc. In most systems I've worked on, one has sorted out the tables by roles into directories, so it is easy to load Crystal by pointing it at the directory. I've written apps that do the same thing by querying the table objects and creating table tables and field tables with relationships (eg, use the table names and field names plus their keys to do the sorting and relating). I did it in the context of creating a schema document generator for a relational systemm, that is, the output is a hypertext document in multiple formats for the table schemas to enable someone to write queries and do conversion work. Taking those same metatables and feeding a query generator is easy enough and adding a topic table to that to save the queries to and feeding a treeview object from that is a piece of cake. Loading all of that from all of the docs is like searching all of the available tables to get that info. Doable but not for the faint of resources. Add full-text to that and it becomes a job for Google farms. How well would Google work if they weren't cacheing the web? len From: Robert Koberg [mailto:rob@k...] Bullard, Claude L (Len) wrote: > Then what you want are the equivalent of > parameterizable stored queries, somewhat > the equivalent of the way engines like > Crystal Reports work. Feed them a schema > and they will give you back a UI with all of > the queriable values from which you select, > parameterize and store the queries. It's > a report generator for XML documents. But wouldn't that require loading *all* the XML docs to be searched into memory? (I don't know Crystal Reports) (my work is in a webapp environment). Using Lucene provides an extremely fast result set using minimal memory. 
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