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GBIF's DNA-derived data extension and MIxS Core Mapping#84

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camilababo wants to merge 15 commits intotdwg:mainfrom
eDNAqua-Plan-project:e-dna-derived-extension
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GBIF's DNA-derived data extension and MIxS Core Mapping#84
camilababo wants to merge 15 commits intotdwg:mainfrom
eDNAqua-Plan-project:e-dna-derived-extension

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This PR addresses the metadata alignment goals discussed in issue #83, where we hope to improve interoperability between standards used for aquatic biodiversity monitoring. It contains a comprehensive mapping between GBIF's DNA-derived data extension and MIxS Core standards. There are three mapping files using SSSOM framework: semantic mappings, syntactic mappings and support mappings. The latter has has not been properly filled in. We want to acknowledge that there is still room for improvement, specifically with ongoing challenges with the syntactic mappings, where it's unclear whether to map based on syntactic context (where expected syntax values have the same conceptual purpose) or specific value matching (where syntax values require exact correspondence). We hope this PR serves as a starting point for a discussion on how these mappings can be refined and how we can contribute to other mapping efforts.

… Baskauf's comments on tdwg#83.

main changes were:
- changed MISX ID in the subject_id to the DNA-derived extension location on the extension page (gbif/portal-feedback#5903)
- replaced subject_label by object_label and vice-versa as they were reversed
- updated subject_category to resolve to the extension page in GBIF's repository of schemas
- added 'semapv' to the curie map for mapping_justification
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