https://github.com/spring-projects/spring-framework: Spring Object/XML Marshalling (Spring IO)
  • Juergen Hoeller 
Root package for Spring's O/X Mapping integration classes.
Contains generic Marshaller and Unmarshaller interfaces,
and XmlMappingExceptions related to O/X Mapping

/**
 * Root package for Spring's O/X Mapping integration classes.
 * Contains generic Marshaller and Unmarshaller interfaces,
 * and XmlMappingExceptions related to O/X Mapping
 */
@NonNullApi
@NonNullFields
package org.springframework.oxm;

import org.springframework.lang.NonNullApi;
import org.springframework.lang.NonNullFields;