Finally, systems may or may not rely on some independent repositories of lexico-semantic knowledge such as thesauri or taxonomies.
It indexes the electronic design notebooks by using manually generated thesauri, that is, collections of related terms.
This is reflected in the differences between monolingual and bilingual dictionaries, and thesauri, which split senses along different lines.
Some of them are encoded in electronic thesauri and dictionaries.
There are some researchers who have tried to build thesauri or taxonomies to classify the documents.
While richer ontological knowledge than thesauri is used, source descriptions have no semantic knowledge.
These include knowledge based approaches that use multilingual dictionaries and thesauri, and corpus based approaches.
The use of controlled vocabularies, or thesauri, has been fundamental to document indexing in library science.
