RE: Use the lucene for searching in the Semantic Web.

2006-01-19 Thread Mathias Lux
Hi! (1) I'm working on a similar problem, but based on MPEG-7 Semantic Description Graphs. I've already a prototype for pakth based matching within Lucene integrated in my sf project Caliph Emir (http://caliph-emir.sf.net). I've already adapted the approach to an ontology, which had to be

Re: Use the lucene for searching in the Semantic Web.

2006-01-19 Thread Erik Hatcher
For some semweb + full-text searching real-world examples, also look to the SIMILE project - http://simile.mit.edu/ They have integrated Lucene into PiggyBank and Longwell. Erik On Jan 18, 2006, at 9:30 PM, xing jiang wrote: Hi, I have done some surveys about the information

Re: Use the lucene for searching in the Semantic Web.

2006-01-19 Thread xing jiang
Hi Mathias, Can you give more details? Is your application for text + ontology, or ontology only? regards jiang xing On 1/19/06, Mathias Lux [EMAIL PROTECTED] wrote: Hi! (1) I'm working on a similar problem, but based on MPEG-7 Semantic Description Graphs. I've already a prototype for

AW: Use the lucene for searching in the Semantic Web.

2006-01-19 Thread Mathias Lux
Its for both, onto + contents (Word, Pdf, PPT, all time the same candidates). The main disadvantage of this approach is that main nodes in the ontology have to be defined. Imagine following use case: An ontology describes a companies content and knowledge management system. Persons,

Re: Use the lucene for searching in the Semantic Web.

2006-01-19 Thread xing jiang
Hi, I am not sure whether my understanding is correct. In your application, A concept document first should be defined as a class in the ontology? Then, each document is an instance of this class. It uses its contents as its features. Also, the related concepts will be added into the feature

AW: Use the lucene for searching in the Semantic Web.

2006-01-19 Thread Mathias Lux
-Ursprüngliche Nachricht- Von: xing jiang [mailto:[EMAIL PROTECTED] Gesendet: Donnerstag, 19. Jänner 2006 13:11 An: java-user@lucene.apache.org Betreff: Re: Use the lucene for searching in the Semantic Web. Hi, I am not sure whether my understanding is correct. In your

Re: Use the lucene for searching in the Semantic Web.

2006-01-19 Thread xing jiang
On 1/19/06, Mathias Lux [EMAIL PROTECTED] wrote: -Ursprüngliche Nachricht- Von: xing jiang [mailto:[EMAIL PROTECTED] Gesendet: Donnerstag, 19. Jänner 2006 13:11 An: java-user@lucene.apache.org Betreff: Re: Use the lucene for searching in the Semantic Web. Hi, I am not

AW: Use the lucene for searching in the Semantic Web.

2006-01-19 Thread Mathias Lux
Actually, my problem is that, for instance, for a document d, Its feature vector may be keywords and concepts. I don't know how to weight the two items. Right now, i used a stupid method, given a document d, i can obtain a rank D based on keyword method. Also, it is annotated with a

Re: Use the lucene for searching in the Semantic Web.

2006-01-19 Thread xing jiang
On 1/19/06, Mathias Lux [EMAIL PROTECTED] wrote: Actually, my problem is that, for instance, for a document d, Its feature vector may be keywords and concepts. I don't know how to weight the two items. Right now, i used a stupid method, given a document d, i can obtain a rank D

AW: Use the lucene for searching in the Semantic Web.

2006-01-19 Thread Klaus
Hi, Actually, my problem is that, for instance, for a document d, Its feature vector may be keywords and concepts. What do you exactly mean by features vector? You are referring to the predicate - object pairs, connected to one subject node, don't you? I don't know how to weight the two items.

Re: Use the lucene for searching in the Semantic Web.

2006-01-19 Thread xing jiang
On 1/20/06, Klaus [EMAIL PROTECTED] wrote: Hi, Actually, my problem is that, for instance, for a document d, Its feature vector may be keywords and concepts. What do you exactly mean by features vector? You are referring to the predicate - object pairs, connected to one subject node, don't

Re: Use the lucene for searching in the Semantic Web.

2006-01-18 Thread adasal
Presumably because this is the way of formulating an inductive statement. Just entering key words doesn't introduce the notion of a relationship between some known and some other unknown terms. Queries match graph patterns against the target graph of the query. From

Re: Use the lucene for searching in the Semantic Web.

2006-01-18 Thread Erik Hatcher
On Jan 17, 2006, at 12:25 PM, jason wrote: I think the Kowari is a system for searching information in the RDF files. It is only for finding information in the meta data files. However, i think one problem of the Semantic Web is that, if we have a document and its RDF annotate, how do we

Re: Use the lucene for searching in the Semantic Web.

2006-01-18 Thread xing jiang
Hi, I have done some surveys about the information retrieval on the Semantic Web, (maybe i miss many papers, most papers i used are published in recent WWW and CIKM conferences, :). 1. A typical way of using the ontology is to select exact term from the domain ontology to form queries. The first

Use the lucene for searching in the Semantic Web.

2006-01-17 Thread jason
Hi friends, How do you think use the lucene for searching in the Semantic Web? I am trying using the lucene for searching documents with ontological annotation. But i do not get a better model to combine the keywords information and the ontological information. regards jiang xing

Re: Use the lucene for searching in the Semantic Web.

2006-01-17 Thread jason
hi Erik, thx for your reply. I think the Kowari is a system for searching information in the RDF files. It is only for finding information in the meta data files. However, i think one problem of the Semantic Web is that, if we have a document and its RDF annotate, how do we retrieve the

Re: Use the lucene for searching in the Semantic Web.

2006-01-17 Thread xing jiang
Hi, I think one problem of the existing method is that, to query on the RDF files or similar structures, we have to form SQL like queries. However, for searching in the text files, we only need to type several keywords. Can we combine the two methods and how can we combine the two methods. For