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We are using an internal JSON metadata format (schema, example) for harmonized indexing and full-text search against an Elasticsearch cluster. Metadata is harvested regulary once a night from configured content providers. During harvesting, metadata Metadata is annotated, e.g. with information from Gazetteers to resolve geographical locations to place names, during harvesting. So users are able to search also for places names not only for geometries.
As content provider you have to map your metadata content against the given JSON Schema. Best you are using international vocabularies for your metadata content. SandboxFor example
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