For a conceptual index, what is generally advised regarding the inclusion of language variations?

Keeping documents separated by language in a conceptual index is generally advised because it maintains clarity and ensures that users can navigate the index effectively according to their linguistic preferences. By organizing documents by language, users can easily find relevant materials without confusion caused by mixing languages, which can lead to misunderstandings or difficulties in comprehension. This approach allows for a more streamlined search process, enhancing user experience and accessibility. Additionally, it aligns with best practices in indexing and information retrieval, as users often seek information in their preferred language, making it more efficient to locate documents when they are categorized accordingly.