Re: [xml-dev] Disk-based XPath Processing

[Tatu Saloranta <cowtowncoder@yahoo.com>]

I'd assume eXist (http://exist.sourceforge.net/) would
also be relevant? And obviously there are commercial
solutions, many of which have free starter editions.

Alas, although there is quite a bit of interest, I
haven't seen solutions where streaming parsers could
use some suitable subset of XPath to match sub-trees
(suitable meaning that only some axes were supported,
parent/grandparent, attribute, children, but not
sibling). I have been hoping to investigate doing this
myself in near future, since it would seem to simplify
some streaming-oriented tasks (like only building
small sub-trees, or one sub-tree at a time from a
bigger document).

-+ Tatu +-

--- Torsten Grust <grust@in.tum.de> wrote:

> Hi Stefan,
> 
>    disk-based XPath and XQuery processing is exactly
> what the  
> companion projects Pathfinder (an XPath/XQuery to
> relational algebra  
> or SQL compiler) and MonetDB/XQuery (a back-end
> database system that  
> can execute Pathfinder's code) are all about.  Both
> projects are open- 
> source.
> 
> On the web:
> 
>    http://www.pathfinder-xquery.org/
>    http://www.monetdb-xquery.org/
> 
> The back-end database system processes relational
> encodings of XML  
> trees (no DOM or similar data structures are
> involved).
> 
> Best wishes,
>     --Torsten
> 
> On Sep 29, 2006, 4:50 PM, Stefan Tilkov wrote with
> possible deletions:
> > Is there something like this? If so, how is it
> implemented? Is it  
> > even reasonable?
> >
> > To clarify: I'm looking for approaches -
> preferably available in  
> > the form of an open source library - that allow
> for running XPath  
> > expressions against an XML document without the
> memory requirements  
> > of creating a full tree in RAM.
> >
> > Any pointers would be greatly appreciated.
> >
> > Stefan Tilkov
> > --
> > Stefan Tilkov, http://www.innoq.com/blog/st/
> >
> >
> >
> >
> >
> >
>
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> --
>    | Prof. Dr. Torsten Grust                        
> grust@in.tum.de |
>    |                                
> http://www-db.in.tum.de/~grust/ |
>    |     Database Systems - Technische Universität
> München (Germany) |
> 
> 
> 
> 
> 
>
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