Reuse of existing ontologies offers a much cheaper alternative than building new ones from scratch, yet tools to support such reuse are still in their infancy. However, more ontologies are becoming available on the web, and online libraries for storing and indexing ontologies are increasing in number and demand. Search engines have also started to appear, to facilitate search and retrieval of online ontologies. This paper presents a fresh view on constructing ontologies automatically, by identifying, ranking, and merging fragments of online ontologies."
Wednesday, February 01, 2006
Ontology Construction from Online Ontologies
ECS EPrints Service - Ontology Construction from Online Ontologies: "One of the main hurdles towards a wide endorsement of ontologies is the high cost of constructing them. Reuse of existing ontologies offers a much cheaper alternative than building new ones from scratch, yet tools to support such reuse are still in their infancy. However, more ontologies are becoming available on the web, and online libraries for storing and indexing ontologies are increasing in number and demand. Search engines have also started to appear, to facilitate search and retrieval of online ontologies. This paper presents a fresh view on constructing ontologies automatically, by identifying, ranking, and merging fragments of online ontologies."
Reuse of existing ontologies offers a much cheaper alternative than building new ones from scratch, yet tools to support such reuse are still in their infancy. However, more ontologies are becoming available on the web, and online libraries for storing and indexing ontologies are increasing in number and demand. Search engines have also started to appear, to facilitate search and retrieval of online ontologies. This paper presents a fresh view on constructing ontologies automatically, by identifying, ranking, and merging fragments of online ontologies."
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TermExtractor is online! It's a FREE and high-performing tool for terminology extraction.
TermExtractor, my master thesis, is online at the
address http://lcl2.di.uniroma1.it.
TermExtractor is a FREE and high-performing software
package for Terminology Extraction and a very useful starting-point for Ontology Construction.
The software helps a web community to
extract and validate relevant domain terms in their
interest domain, by submitting an archive of
domain-related documents in any format
(txt, pdf, ps, dvi, tex, doc, rtf, ppt, xls, xml,
html/htm, chm, wpd and also zip archives.)
TermExtractor extracts terminology consensually
referred in a specific application domain. The
software takes as input a corpus of domain documents,
parses the documents, and extracts a list of
"syntactically plausible" terms (e.g. compounds,
adjective-nouns, etc.).
Documents parsing assigns a greater importance
to terms with text layouts (title, abstract, bold, italic,
underlined, etc.). Two entropy-based measures, called
Domain Relevance and Domain Consensus, are then used.
Domain Consensus is used to select only the terms
which are consensually referred throughout the corpus
documents. Domain Relevance to select only the terms
which are relevant to the domain of interest, Domain
Relevance is computed with reference to a set of
contrastive terminologies from different domains.
Finally, extracted terms are further filtered using
Lexical Cohesion, that measures the degree of
association of all the words in a terminological
string.
NEW: Now TermExtractor allows to a group of users to
validate an extracted terminology. See the news at
http://lcl2.di.uniroma1.it/termextractor/news.jsp
--
Francesco Sclano
home page: http://lcl2.di.uniroma1.it/~sclano
msn: francesco_sclano@yahoo.it
skype: francesco978
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