Fix for error:

dataCorrupted(Swift.DecodingError.Context(codingPath: [CodingKeys(stringValue: "relationship", intValue: nil), XMLKey(stringValue: "4", intValue: 4), XMLKey(stringValue: "4", intValue: 4), CodingKeys(stringValue: "type", intValue: nil)], debugDescription: "Cannot initialize SchemaType from invalid String value http://schemas.openxmlformats.org/officeDocument/2006/relationships/sheetMetadata", underlyingError: nil))

Reproduced after converted a fairly complex .numbers file to .xlsx