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From Erik Hatcher <>
Subject Re: Hierarchical document
Date Mon, 20 Oct 2003 22:41:24 GMT
One more thought related to this subject - once a nice scheme for 
representing hierarchies within a Lucene index emerges, having XPath as 
a query language would rock!  Has anyone implemented O/R or XPath-like 
query expressions on top of Lucene?

On Monday, October 20, 2003, at 12:31  PM, Erik Hatcher wrote:

> On Monday, October 20, 2003, at 11:06  AM, Tom Howe wrote:
>> contain Section and Study information and then, if a user wants a set 
>> of
>> Study documents, just aggregate them after the search by hand or is
>> there a more "lucene" way of doing this?  I'm trying to avoid storing
>> too much redundant information to implement this kind of hierarchical
>> structure, but that may not be possible.  I hope I'm being somewhat
>> clear with my question.
> There is not a more "lucene" way to do this - its really up to you to 
> be creative with this.  I'm sure there are folks that have implemented 
> something along these lines on top of Lucene.  In fact, I have a 
> particular interest in doing so at some point myself.  This is very 
> similar to the object-relational issues surrounding relational 
> databases - turning a pretty flat structure into an object graph.  
> There are several ideas that could be explored by playing tricks with 
> fields, such as giving them a hierarchical naming structure and 
> querying at the level you like (think Field.Keyword and PrefixQuery, 
> for example), and using a field to indicate type and narrowing queries 
> to documents of the desired type.
> I'm interested to see what others have done in this area, or what 
> ideas emerge about how to accomplish this.
> 	Erik
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