LD4IE Challenge 2014 - MicroRaptor (μRaptor)

Abstract

This paper describes μRaptor, a DOM-based method to extract hCard microformats from HTML pages stripped of microformat markup. μRaptor extracts DOM sub-trees, converts them into rules, and uses them to extract hCard microformats. Besides, we use co-occurring CSS classes to improve the overall precision. Results show 0.96 precision and 0.83 F1 measure by considering only the most common tree patterns. Furthermore, we propose the adoption of additional constraint rules on the values of hCard elements to further improve the extraction.

What μRaptor does?

μRaptor was created to extract hCard microformats from webpages without explicit markup. μRaptor was submitted to Linked Data for Information Extraction Challenge at LD4IE 2014. Thus, you can use μRaptor to extract hCard microformats from HTML pages, and evaluate your extracted n-quads comparing them against the ones extracted by Apache Any23.

Installation

Download μRaptor from its GitHub repository.

	git clone https://github.com/emir-munoz/uraptor.git

μRaptor uses Maven to create an executable file.

	mvn clean package

You can package the project and use the scripts generated in folder target/ld4ie-cli/bin.

How to use μRaptor?

Usage: uRaptor [options]
  Options:
    -evaluate
       Run evaluation of RDF n-quad files
    -extract
       Run microformat extraction
    -gold
       [Evaluate] Gold standard n-quad file
    -input
       [Extract] Input HTMLs file
    -model
       [Evaluate] Extracted n-quad file
    -output
       [Extract] Output N-Quads file

To execute an extraction, indicate the input file from the challenge with the clean HTML pages and a location for the output n-quads file.

To execute an evaluation, indicate the location of the gold standard file and μRaptor extraction file.

Example:

	./uRaptor -extract train1.clean.html.txt.gz train1.out.nq

	or

	./uRaptor -evaluate train.out.nq train1.nq

License

GNU General Public License v3.0

μRaptor: A DOM-based system with appetite for hCard elements
Copyright (C) 2014

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

Supports Java 1.7.