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This is a way of filtering the set of documents resulting from the query presented

in Figure 4.1 or even of completing it with new documents. This approach consists of

using the relations described in an ontology in order to build the query result.

To our knowledge, only the CITER GIRS [PFO 09] uses themes coming from an

ontology: itisonlyinthephaseofIRthattheuserselectsathemeintheproposedlist

for the search.

4.2.1.2. Spatial dimension

We are interested in the interpretation of spatial information detected in texts. Our

objective is to make more accurate the approximation of the SFs indexed by the PIV

process flow.

The current version of the PIV system proposes specific functions of calculating

spatial relation representations [LES 07, SAL 08]. These functions are mainly based

on propositions contributing to the interpretation of relations of adjacency and

inclusion made by Malandain [MAL 00].

Figure 4.2 illustrates the adjacency function supporting the calculation of a

polygon from an initial geometry. This function contains two parameters: the

geometry geom of the reference SF and the distance d corresponding to the scope

associated with this adjacency relation. It proposes a numeric interpretation of

information expressed by phrases such as “next to, close to, around, in the periphery

of, in the proximity of, in the surroundings of, nearby, encircling”.

Figure 4.2. Interpretation of adjacency: basic adjacency function

It is possible to go further in the definition of such functions. For example, the

adjacency function can be improved and so extended to the use of four parameters,

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