Release 2003/09/19. This schema is for infomational purposes only, and is not normative! Notes: - Identity constraints in comments, in order to avoid any clashes with the existing ones. - The elements are defined as abstract to prevent their usage in practice. SCL for an IED Capability Description (ICD) SCL for a "Pure" System Specification Document (SSD) SCL for a System Specification Document (SSD) SCL for a Substation Configuration Description (SCD) SCL for a Configured IED Description (CID)