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Requesting the xsd can be done by sending a request to:
https://<environment>/schemas/<schema version>/classifications/<classification or versioning id>/version/<version>/<record type>/mhs.xsd
Schema version corresponds with Metadata Sidecar Versions
Classification or versioning id of the record for which you want to request the XSD
Version is 1 if the classification is not versioned or different if your classification has multiple versions
Record type is an optional property can be added to only get the fields applicable for the specified record type.
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