Documented DataContractContentSerializer class

and ctor, but not yet other members.
Documented DataContractContentSerializer.Serialize
Documented Deserialize method

of DataContractContentSerializer.
Documented XmlContentSerializer class and ctor,

but not yet any other members.
Documented XmlContentSerializer.Serialize.
Documented XmlContentSerializer.Deserialize.
Documented AtomFeed class,

but none of its members.
Documented AtomFeed constructor.
Documented properties of AtomFeed.
Documented copy-and-update methods.
Documented AtomEventStore.WriteTo method.
Documented AtomFeed.ReadFrom method.
Documented AtomFeed.AddLink method.
Documented AtomFeed.Parse method.
Documented UuidIri struct,

but not yet its members.
Documented UuidIri constructor.
Documented UuidIri.ToString().
Added an example value of a UuidIri.
Documented conversions to and from Guid.
Documented Parse and TryParse methods of UuidIri.