SEAN

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Latest revision as of 20:01, 23 July 2012

SEAN is a natural language analysis system. It represents natural language texts as semantic networks in the UNL format. In its current release, it is a web application developed in Java and available at the UNLdev.

The name

SEAN is an acronym for Shallow Enhanced ANalysis system.

Requirements

As a universal engine, SEAN must be parameterized to the source languages with the following files, to be provided through SEAN's interface:

• The input natural language document, i.e., the document to be UNL-ized
• The NL-UNL (analysis) dictionary, i.e., a lexical database where UWs are mapped into natural language entries, along with the corresponding features, to be provided according to the UNL Dictionary Specs
• The NL-UNL (analysis) transformation grammar, i.e., a set of of transformation rules used to convert natural language sentences into UNL graphs, to be provided according to the UNL Grammar Specs
• The NL-UNL (analysis) disambiguation grammar, i.e, a set of disambiguation rules used to improve the results of the tokenization and of the transformation

Functioning

SEAN performs the three following movements over the input file:

• Segmentation, i.e., the division of the input document into a series of processing units (sentences), which are processed one at a time
• Tokenization, i.e., the identification of the tokens (lexical items) of each sentence of the input document
• Transformation, i.e., the application of the transformation rules of the grammar over each tokenized sentence in order to represent it as a UNL graph