The second topic deals with issues of query translation and expansion based on parallel corpora. Query expansion can raise the recall or the precision of the search, depending on the type of semantic knowledge incorporated. That is the related terms narrow or broaden the semantic space of the original query terms. The application of methods such as Latent Semantic Indexing to parallel corpora are well known in that area. Words in documents of the same subject domains do not co-occur randomly but they rather create semantic clusters, they show semantic implicit interdependencies among them.
Words belonging to the same subject domain in a different language share the same semantic space.
In the third topic we examined Web based CLIR . The system design allows the parameterisation both of the summarisation process and the languages being summarised. Summarisation is based on sentence selection. The system uses MT to translate the produced summaries from other languages into English. Keizai 's query translation presents extended English definitions of query terms and phrases together with their Japanese and Korean translations.