https://learn.microsoft.com/pt-br/dotnet/api/system.servicemodel.messagecontractmemberattribute.namespace?view=netframework-4.8.1&viewFallbackFrom=net-10.0-pp
MessageContractMemberAttribute.Namespace Property (System.ServiceModel) | Microsoft Learn
Specifies the namespace of the element that corresponds to this member.
property systemnamespacemicrosoftlearn