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Thank you @RubenVerborgh , but with LDP you cannot retrieve just part of a document, can you ?
What about the scenario of a social app, with all your comments to posts stored on a document on your pod. With only a few comments , it is ok to retrieve the full document client side. But if the users have done thousands of comments, it does not makes sense to retrieve them all on the client and then handle the query in the comments (to get all the comments for a given post for example) client side… In this case I want to be able to query with SPARQL (or similar) just the comments I want and let the server do the work and give me back only what I need ! If we want to be able to develop real life, scaling applications on top of SOLID, this seems mandatory to me.
Also, I have noticed that when I want to retrieve just one entry of a document (using myuri#myentry), I realize that I retrieve client side the full document !