hi, I'm using an algorithme based on cosine similarity with TF-IDF to find if document X is similar to document Y. But I want to know more about X and Y if they are similar, I want to know if X contains Y, I mean if the information in Y are included withing X. the most important aspect for me is the semantic of the inclusion, not only the ocuurence of the terms of documents Y in the document X. many thanks