S3Grant.fromXml constructor
      
      S3Grant.fromXml(
    
    
- XmlElement elem
 
Implementation
factory S3Grant.fromXml(_s.XmlElement elem) {
  return S3Grant(
    grantee:
        _s.extractXmlChild(elem, 'Grantee')?.let((e) => S3Grantee.fromXml(e)),
    permission:
        _s.extractXmlStringValue(elem, 'Permission')?.toS3Permission(),
  );
}