Toby A Inkster ha scritto:
It should be noted in this case that RDFa also allows natural language parsers to be made more useful. By looking at the RDFa which marks up the author's name and website, they may be able to determine that the comment has been written by someone other than the page's main author, and thus not afford it the same level of trust granted to the rest of the page. So the natural language processing can benefit from RDFa.
That's true only if one can assume metadata are trustful, but they are only if they can be under a strict control, that is on a small-scale application. On a wider scale, one needs to make the opposite assumption, because it would or might be more common to find fake metadata with "honest" content (the prose of an advertisement does not lie, but related metadata can tell it's a different think to cheat a metadata-based UA), either because a site author can be a party to the spammer, or because authors can mess up metadata (yeah, they can mess up html code too, but that's either not a problem, because a UA can present the content as well, or it is but it might damage the author more than it may harm the user). If metadata are created/used for external consumption, they can be just ignored by authors, who instead may just copy&paste code or reuse templates in different contexts, without being able to set proper metadata for the new content. Thus UAs can't rely on metadata /in general/, while they might /in some/, small-scale scenarios.
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