Some properties are written predominantly in one language but contain words or phrases in another language or languages. You can assign to such a property the language ID of the language in which the property is written predominantly.

Any queries against the property must have the same language ID as the property. However, search terms in any of the languages that a property contains will return expected results.

Language-specific functions will be applied to search terms for the language specified in the property's language ID. Thus, if the language ID of a property is ja, any language-specific functions such as stemming that are applied to the property will be for Japanese; these functions will be applied to all words in the search terms, although they work well only for the language of the language ID.