ORM-ML: XML schema for ORM metamodel

In order to share, exchange, and process ORM (Object Role Modeling) schemas on Internet and the open connectivity environments, some versions of ORM-ML (ORM Markup Language) have been proposed. However, there still exist some issues need to correct or improve. Based on existing works and researches about meta-model of ORM 2.0, this paper proposed a concise and complete version of ORM-ML.