Entity Relationship Diagram Symbols About Entity-relationship Diagram. The so-called semantic modeling method nowadays is. In the Release notes it is stated (https://wiki.documentfoundation.org/R.) that there are new arrowheads for using in making ERD (Entity Relationship Diagrams). These do not show in my installation of 5.3.1. Where do I find them? Normalize the database tables to third normal form (3NF). Identify and create an Entity-Relationship (E-R) Diagram relating the tables of the…