In an attempt to create a lean vocabulary for incremental recording and step-wise formalisation of personal knowledge, we identified a set of common knowledge structures. These Conceptual Data Structures (CDS) were found to be inherent to a variety of different knowledge artefacts ranging from vague paper notes to highly structured documents. CDS is suitable for representing knowledge in various degrees of formalisation a uniform fashion, allowing gradual migration. CDS serves two purposes: First, as a guideline for future Personal Knowledge Management (PKM) tools, providing a set of crucial structural primitives. Second, the RDF-based representation of CDS can serve as a knowledge exchange format. It is capable of representing also vague or even inconsistent knowledge structures between people and PKM tools without unnecessary loss of information.
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