 In addition to graphical representation, there is typically a requirement to provide metadata to the Defense Information Technology Portfolio Repository (DITPR) or other architectural repositories.DoDAF has a meta-model underpinning the framework, defining the types of modelling elements that can be used in each view and the relationships between them.DoDAF versions 1.0 thru 1.5 used the CADM meta-model, which was defined in IDEF1X (then later in UML) with an XML Schema derived from the resulting relational database.