E/R schema for the Datrix C/C++/Java exchange format

A SEF (software exchange format), such as GXL (Holt et al., 2000), TA (Holt, 1997) or RSF (Wong, 1996), is used to exchange data between tools that analyze software. Researchers at Bell Canada have specified the Datrix SEF in TA (and soon to be, GXL) for C, C++ and Java. It is designed so that a parser for the language, C, C++ or Java, can read a source program and emit the program's abstract syntax tree (AST) in the Datrix format. This note explains how an entity/relation (E/R) schema (Chen, 1976) was extracted for Datrix, and gives this schema as an E/R diagram.