What is the format of the DataContractAttribute.Namespace Property?

This MSDN article recommends always to provide a namespace to a ServiceContract and DataContract.

Examples usually have a "schema" prefix and a URI type pattern for the namespace such as

Namespace="urn:WCFEssentials/Samples/2008/12"

instead of a traditional C# namespace with dot-notation such as

Namespace="MyNamespace.MyDataClasses"

What is the suggested format the namespace property? Do we need the schema prefix? Why is this format suggested?

It's an XML Namespace. Those can either be in the urn: format or they can be URLs.

Here are some additional suggestions from MSDN:

The namespace can be any string
but is traditionally a Uri representative of the company or application domain
and includes a year and month to support versioning scenarios.
For DataContracts, the namespace is often similar to the ServiceContract namespace
but uses using a “schemas” uri section

Example Service Contract with Namespace

[ServiceContract(Namespace="urn:CompanyName/ApplicationName/YYYY/MM")]
[ServiceContract(Namespace="urn:BigFont/EmailSystem/2014/03")]

Example Data Contract with "Schema" Segment in Namespace

[DataContract(Namespace="urn:CompanyName/Schema/YYYY/MM")]
[DataContract(Namespace="urn:BigFont/Schema/2014/03")]

Thank you to John Saunders or getting me started.

来源：https://stackoverflow.com/questions/22516894/what-is-the-format-of-the-datacontractattribute-namespace-property

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