release-notes/7.0/preview/api-diff/rc1/Microsoft.NETCore.App/7.0-rc1_System.Xml.Serialization.md


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# System.Xml.Serialization

``` diff
 namespace System.Xml.Serialization {
     public class XmlSerializer {
-        public static XmlSerializer[] FromMappings(XmlMapping[]? mappings);
+        public static XmlSerializer?[] FromMappings(XmlMapping[]? mappings);
-        public static XmlSerializer[] FromMappings(XmlMapping[]? mappings, Type? type);
+        public static XmlSerializer?[] FromMappings(XmlMapping[]? mappings, Type? type);
-        public static XmlSerializer[] FromTypes(Type[]? types);
+        public static XmlSerializer?[] FromTypes(Type[]? types);
     }
 }
```