System.Xml 2.0.0.0 4.0.0.0 System.Object This class describes a schema importer, which transforms an XML schema into corresponding code entities. The class is the parent class of the class, which implements this functionality. Describes a schema importer. Property 2.0.0.0 4.0.0.0 System.Xml.Serialization.Advanced.SchemaImporterExtensionCollection To be added. Schema importer extensions modify the behavior of objects. By adding objects to this collection, you can customize the code generated by specific schema patterns. Gets a collection of schema importer extensions.