On Jul 22, 2005, at 4:37 AM, Namrata Kumari wrote:
- Well, the application I want to develop is more like storing xml
files and
with each of them having different structure. And then performing
search on
them that in turn can depend on the structure of the xml doc and
user's
requirement.
That's still a pretty generic requirement. What type of queries?
XPath?
- Moreover, I did not exactly understood as to how I can store the xml
document. I mean, I went through the java doc and couldnot figure
out the
api's that could be used for this purpose. Can you guide me in this?
Look at the various types of fields. There is a "stored" attribute
on Field that allows the field to be stored.
- But the biggest question is: Is Lucene a good option [which now I
doubt on
the basis of what I have read till now :-(]
It really all depends. I built a search engine for the Rossetti
Archive (http://www.rossettiarchive.org/rose/) which indexes XML
files like this:
http://www.rossettiarchive.org/docs/1-1847.s244.raw.xml
XPath queries are not possible into the XML, but that is also not a
use case for the system. Highly structured queries such as this one
are supported because the indexing process extracted detailed
information from the XML files:
http://www.rossettiarchive.org/rose/?query=%2Bgenre%3Asonnet+%2B%
28author%3Arossetti+OR+author%3Adgr%29+%2Byear%3A%5B1850+TO+1870%5D
I still do not have a clear cut understanding of your needs and thus
still not sure if Lucene is suitable or not. Certainly for full-text
searches it is a fine choice, but the structured queries are a
different story.
Erik
Regards,
Namrata
-----Original Message-----
From: Erik Hatcher [mailto:[EMAIL PROTECTED]
Sent: Friday, July 22, 2005 2:11 PM
To: general@lucene.apache.org
Subject: Re: Lucene as xml store
On Jul 22, 2005, at 1:07 AM, Namrata Kumari wrote:
hi,
I am a beginner to lucene , So kindly excuse me if the questions
mentioned a bit naive.
- Can I use lucene as an xml store + search engine?
- What I understood is that if we want to perform search on xml doc.
we need to parse xml document, form indexes and on the basis of
fields
perform search.
- So, does this mean, that even if we use lucene as xml store (IF WE
CAN!!), we need to parse it to form indexes?
Lucene is a search engine and only deals with text (Strings
essentially).
Lucene is also a flat document space and doing queries for things
hierarchical is not how it was designed, but it can be done to a
limited
degree depending on how data is indexed.
Yes, Lucene can store text as well as make it searchable - so you
could
store an XML document in it as well.
You have not provided any information on the types of queries you
need to
support or what the user experience will be like. There are many
ways to
use Lucene and whether it is suitable solution to your
application depends on that information. Tell us more about what
you're wanting to do and we can guide you further.
Please reply to this as soon as possible
That's what they all say! :) No need to say such a thing - if you
have well articulated questions that are straightforward enough to
answer,
you'll get responses quickly here.
Erik
