Generate fields for all Identityrefs in an Union binding class.

identity compliance-code-identity {
  description
    "Base identity for reporting pluggable compliance codes per port.";
} 

identity network-phy-code-identity {
  description
    "base identity for network phy code.";
}
  
identity client-phy-code-identity {
  description
    "base identity for client phy code.";
}

type union {
  type identityref { base compliance-code-identity; }
  type identityref { base client-phy-code-identity; }
  type identityref { base network-phy-code-identity; }
  type uint64;
  type decimal64 {
    fraction-digits 8;
  } 
}

public class ComplianceCodesUnion implements TypeObject, Serializable {
  private static final long serialVersionUID = -3780142905034216089L;
  private final Class<? extends ComplianceCodeIdentity> _identityref;
  private final BigInteger _uint64;
  private final BigDecimal _decimal64;