https://www.spring.io/spring-data/spring-data-commons: Global parent pom.xml to be used by Spring Data modules (Pivotal Software, Inc.) 
Central domain abstractions especially to be used in combination with the Repository abstraction. 
See Also:
/**
 * Central domain abstractions especially to be used in combination with the
 * {@link org.springframework.data.repository.Repository} abstraction.
 *
 * @see org.springframework.data.repository.Repository
 */
@org.springframework.lang.NonNullApi
package org.springframework.data.domain;