How Do I Resolve Invaliddatacontractexception

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XML-documentation

Hi,
I got the below exception when i tried to access wcf service which returns xmldocument from client.
Can anyone help me in resolving the below issue.

Type 'System.Xml.XmlDocument' cannot be serialized. Consider marking it with the DataContractAttribute attribute, and marking all of its members you want serialized with the DataMemberAttribute attribute. If the type is a collection, consider marking it with the CollectionDataContractAttribute. See the Microsoft .NET Framework documentation for other supported types.

Thanks