<PackageReference Include="System.ServiceModel.Primitives" Version="8.1.1" />

System.ServiceModel.Channels.RelatesToHeader

class RelatesToHeader : AddressingHeader
public virtual Uri RelationshipType { get; }

public UniqueId UniqueId { get; }

public static RelatesToHeader Create(UniqueId messageId, AddressingVersion addressingVersion)

public static RelatesToHeader Create(UniqueId messageId, AddressingVersion addressingVersion, Uri relationshipType)

public static RelatesToHeader ReadHeader(XmlDictionaryReader reader, AddressingVersion version, string actor, bool mustUnderstand, bool relay)

public static void ReadHeaderValue(XmlDictionaryReader reader, AddressingVersion version, out Uri relationshipType, out UniqueId messageId)