Spatial and Temporal Information Retrieval in Textual Corpora - Geographical Information Retrieval in Textual Corpora - page 42

the nature of the adjacency (“toward” and “the years”) and on the range of the
reference period. For inclusion, the bounds of the reference period are reduced: the
algorithm depends on the nature of the inclusion (“beginning”, “middle” and “end”)
and on the range of the reference period. For example, an inclusion of the first type
corresponds to the beginning of the third reference period. For orientation, the
reference period is extended at the level of one of its two bounds. This extension
depends on the nature of the adjacency (“before” and “after”) and on the range of the
reference period. The relation of interval between two reference periods denotes a
new period covering the first two: the lower bound of this new period is that of the
first period and its upper bound is that of the second period. Finally, the relation of
enumeration denotes a list of values associated with a reference period such as “12,
15 and 20 July 1916” whose reference ATF site is “20 July 1916” and the associated
values are “12 and 15”. Thus, the target timestamps representing “12, 15 and 20 July
1916” are [1916-07-12, 1916-07-12], [1916-07-15, 1916-07-15] and [1916-07-20,
1916-07-20]. These recursive interpretation processes are described in [LEP 07].
Figure 2.8. Interpretation of the five temporal relations of the core
model - simplified illustration taken from [LEP 07]
2.4.5. Spatial and temporal IR: PIV prototype
This section describes the process of retrieval that uses the indexes created earlier.
The process has to facilitate the access to the documents of the corpus in the case of
queries having a spatial or temporal dimension. The query can be expressed in free
text and, in this case, is subject to the same process as the documents. It is therefore
translated into georeferenced areas, respectively, in calendar periods, which will be