public XElement Serialize()
{
return(new XElement(UblNames.Cac + nameof(ExternalReference),
URI.Serialize(nameof(URI)),
DocumentHash.Serialize(nameof(DocumentHash)),
HashAlgorithmMethod.Serialize(nameof(HashAlgorithmMethod)),
ExpiryDate.Serialize(nameof(ExpiryDate)),
ExpiryTime.Serialize(nameof(ExpiryTime)),
MimeCode.Serialize(nameof(MimeCode)),
FormatCode.Serialize(nameof(FormatCode)),
EncodingCode.Serialize(nameof(EncodingCode)),
CharacterSetCode.Serialize(nameof(CharacterSetCode)),
FileName.Serialize(nameof(FileName)),
Description.Serialize(nameof(Description))
));
}