Customizing the metamodel : Symbols: Creating and modifying : Depicting a symbol with a bitmap or metafile : User-defined symbol presentation based on property value
  
User-defined symbol presentation based on property value
You may specify how a symbol gets drawn based on the value of a property of the symbol’s definition. In UML, this property is generally a stereotype. However, this functionality applies across the board to all symbol types, not just UML symbols, and not just to the stereotype property.
To enable this function, the Depictions clause is used in a List in usrprops.txt. For example, here is an example of how a class stereotype is handled in saprops.cfg:
List "Class Stereotypes"
{
Value "actor" depictions {diagram images\slctact.wmf menu images\slctact.bmp}
...
}
An Images folder in every encyclopedia now houses .bmp files or .wmf files to support this function.