• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Jeanne Boyarsky
  • Ron McLeod
  • Paul Clapham
  • Liutauras Vilda
Sheriffs:
  • paul wheaton
  • Rob Spoor
  • Devaka Cooray
Saloon Keepers:
  • Stephan van Hulst
  • Tim Holloway
  • Carey Brown
  • Frits Walraven
  • Tim Moores
Bartenders:
  • Mikalai Zaikin

XML Filtering using XPath

 
Ranch Hand
Posts: 61
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hi,

I have a problem to solve. I need to filter very large XML documents using XPath. I need to provide a list of xpaths to generate a smaller versions of the documents. for example...

Input:XPathOutput:What is a good way to do this using Java APIs?

Thanks!
Eurig
 
Author and all-around good cowpoke
Posts: 13078
6
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
If your input XML document is truly "very large" - too large to get in memory as a DOM - the standard library XPath will not help you because it requires a DOM to work with.

For documents too big for DOM, you are stuck with some form of SAX or StAX parsing.

I found Harold's chapter on SAX filters to be very helpful when thinking about big SAX problems.

You might find the servingXML toolkit to be helpful.

Bill
 
Ranch Hand
Posts: 63
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
How large an xml file william are we talking before looking into streaming xml instead of parsing as a DOM and using xpath and xquery to query the data?
 
Don't get me started about those stupid light bulbs.
reply
    Bookmark Topic Watch Topic
  • New Topic