DataLad extension for semantic metadata handling

This software is a DataLad extension that equips DataLad with an alternative command suite for metadata handling (extraction, aggregation, reporting). It is backward-compatible with the metadata storage format in DataLad proper, while being substantially more performant (especially on large dataset hierarchies). Additionally, it provides new metadata extractors and improved variants of DataLad’s own ones that are tuned for better performance and richer, JSON-LD compliant metadata reports.

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