an Entity references as follows:
Apache Attic is a project of Apache Software Foundation to provide processes to make it clear when an Apache project has reached its end-of-life. The Attic project was created in November 2008. Also the retired projects can be retained. Projects may not stay in the attic forever: e.g. Apache XMLBeans is now a project of Apache Poi, but was previously in the attic from July 2013 until June 2018.