Sandrila SDL implements the graphical software design standards commonly used telecommunications and real-time software. Sandrila SDL comprises a template, a set of stencils and an add-on for Visio that will allow the whole range of SDL MSC URN UML and UML2 diagrams to be created. V3 adds SDL-CIF (Z.106) import from other SDL tools. V4 adds updates to the SDL specification for 2006.