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diff --git a/release-notes/7.0/preview/api-diff/rc1/Microsoft.NETCore.App/7.0-rc1_System.Runtime.Serialization.DataContracts.md b/release-notes/7.0/preview/api-diff/rc1/Microsoft.NETCore.App/7.0-rc1_System.Runtime.Serialization.DataContracts.md
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+++ b/release-notes/7.0/preview/api-diff/rc1/Microsoft.NETCore.App/7.0-rc1_System.Runtime.Serialization.DataContracts.md
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+# System.Runtime.Serialization.DataContracts
+
+``` diff
++namespace System.Runtime.Serialization.DataContracts {
++    public abstract class DataContract {
++        public virtual DataContract? BaseContract { get; }
++        public virtual string? ContractType { get; }
++        public virtual ReadOnlyCollection<DataMember> DataMembers { get; }
++        public virtual bool IsBuiltInDataContract { get; }
++        public virtual bool IsISerializable { get; }
++        public virtual bool IsReference { get; }
++        public virtual bool IsValueType { get; }
++        public virtual Dictionary<XmlQualifiedName, DataContract>? KnownDataContracts { get; }
++        public virtual Type OriginalUnderlyingType { get; }
++        public virtual XmlDictionaryString? TopLevelElementName { get; }
++        public virtual XmlDictionaryString? TopLevelElementNamespace { get; }
++        public virtual Type UnderlyingType { get; }
++        public virtual XmlQualifiedName XmlName { get; }
++        public virtual XmlQualifiedName GetArrayTypeName(bool isNullable);
++        public static DataContract? GetBuiltInDataContract(string name, string ns);
++        public static XmlQualifiedName GetXmlName(Type type);
++        public virtual bool IsDictionaryLike([NotNullWhenAttribute(true)] out string? keyName, [NotNullWhenAttribute(true)] out string? valueName, [NotNullWhenAttribute(true)] out string? itemName);
++    }
++    public sealed class DataContractSet {
++        public DataContractSet(DataContractSet dataContractSet);
++        public DataContractSet(ISerializationSurrogateProvider? dataContractSurrogate, IEnumerable<Type>? referencedTypes, IEnumerable<Type>? referencedCollectionTypes);
++        public Dictionary<XmlQualifiedName, DataContract> Contracts { get; }
++        public Dictionary<XmlQualifiedName, DataContract>? KnownTypesForObject { get; }
++        public Dictionary<DataContract, object> ProcessedContracts { get; }
++        public Hashtable SurrogateData { get; }
++        public DataContract GetDataContract(Type type);
++        public DataContract? GetDataContract(XmlQualifiedName key);
++        public Type? GetReferencedType(XmlQualifiedName xmlName, DataContract dataContract, out DataContract? referencedContract, out object[]? genericParameters, bool? supportGenericTypes = default(bool?));
++        public List<XmlQualifiedName> ImportSchemaSet(XmlSchemaSet schemaSet, IEnumerable<XmlSchemaElement> elements, bool importXmlDataType);
++        public void ImportSchemaSet(XmlSchemaSet schemaSet, IEnumerable<XmlQualifiedName>? typeNames, bool importXmlDataType);
++    }
++    public sealed class DataMember {
++        public bool EmitDefaultValue { get; }
++        public bool IsNullable { get; }
++        public bool IsRequired { get; }
++        public DataContract MemberTypeContract { get; }
++        public string Name { get; }
++        public long Order { get; }
++    }
++    public sealed class XmlDataContract : DataContract {
++        public bool HasRoot { get; }
++        public bool IsAnonymous { get; }
++        public bool IsTopLevelElementNullable { get; }
++        public bool IsTypeDefinedOnImport { get; set; }
++        public new bool IsValueType { get; set; }
++        public XmlSchemaType? XsdType { get; }
++    }
++}
+```
+