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1. The document discusses tagging, which is a widely used practice for pictures, bookmarks, videos, blog posts, emails, and music, as it has advantages like not requiring a predefined schema, allowing emergent user vocabularies, and enabling browsing and social aspects. 2. However, the document notes tagging has limitations like ambiguity, where one tag can represent different concepts, and tags use acronyms or homonyms, and heterogeneity, where different tags can represent the same concept due to variations in case, synonyms, or internationalization.






















