For me, the sections and subsections make much more sense of how it works. It means that he had 3 ways into his notes: the sections/subsections, the keyword index and the structure notes (usually, it seems, close to the 'front' of a subsection but also quickly accessed through the index).
The sections/subsections are easily replicated with tags (or folders).
The keyword index not quite so easily. Tags could be used, but the number of words in any index is too many for a reasonable tagging system. Text search will find to many notes unless there's a way or restricting it. Luhmann wrote keywords on the cards; combining that with text search would be able to replicate Luhmann's system (keywords would need a prefix so that they are easily identified).
Structure notes can be done in exactly the way Luhmann used them.
The sections/subsections are easily replicated with tags (or folders).
The keyword index not quite so easily. Tags could be used, but the number of words in any index is too many for a reasonable tagging system. Text search will find to many notes unless there's a way or restricting it. Luhmann wrote keywords on the cards; combining that with text search would be able to replicate Luhmann's system (keywords would need a prefix so that they are easily identified).
Structure notes can be done in exactly the way Luhmann used them.








