Language Extension Pack series 400 for dtSearch Text Retrieval Engine for Win & .NET and dtSearch Web with Spider V6.5 or later.

dtSearch Text Retrieval Engine for Win & .NET and dtSearch Web are supplied with stemming rules and a noise-word file for English(US). Stemming is the only search expansion option which is 'on' by default in the dtSearch end-user products; the reason for this is that stemming is almost always useful when making a search, and adds little to the time required to make a search. Unlike some other search engines, dtSearch applies stemming at search time, there is no need to build indexes specifically to apply stemming and no need to build separate indices for each language in use.

With the stemming option selected dtSearch will find plurals and many other variations; for example a search on print will find printers, printing, printed automatically. However, if you are searching documents written in other languages, the English stemming rules will cause you to miss many word variations which do not occur in English (e.g. verb and noun changes with gender), and you may find that words which are unrelated are found in error.

Furthermore, the English noise word list, which is designed to remove unwanted English words from your index to keep the index size small, is not suitable for other languages; your indexes may contain many words which will not be useful in searches and which will add to the size of your indexes.

The solution is to use language specific files in place of the default US English files. These are supplied in the form of dtSearch Language Extension Packs which contain files for many languages, see list below. All files are in Unicode format.

Language Extension Packs 400 Series

Western European Group (Lep402)

• Danish
• Dutch
• English
• Finnish
• French*
• German*
• Italian
• Norwegian
• Portuguese
• Spanish
• Swedish
• * LEP400 and LEP402 also include unique bi-lingual French/English and German/English stemming and noise word files which enables search expansion on indexes and documents containing a mix of French/German and English text.

Eastern European Group (Lep403)

• Belurusian
• New Bulgarian
• Czech
• Estontian
• Greek
• Hungarian
• Latvian
• Lithuanian
• Polish
• Russian
• Slovak
• New Slovenian
• Turkish
• Ukrainian

Language Packs include:
Stemming rule files and noise word files for each supported language
Test files to check the operation of stemming in all the supplied languages.
Stemming Language Selector application, changes stemming rules from the Windows Start menu.
One year of on-line technical support and updates.