Journaling File System for Linux.
Intends to handle all sorts of structured data, not just files. We need a core architecture for the semantics to ensure we end up with a coherent whole. This paper suggests a set theoretic model for those semantics. The relational models would at times unacceptably add structure to information, the keyword models would at times delete structure, and purely hierarchical models would create information mazes. Reworking their primitives is required to synthesize the best attributes of these models in a way that allows one the flexibility to tailor the level of structure to the need of the moment.
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