Enum values must be prefixed with the name of the enum, for example:
myXSIApp.LogMessage( "Hello, World!", siSeverityType.siWarning );
String constant values must be prefixed with "StringModule", for example:
myXSIApp.LogMessage( myObj.BelongsTo(StringModule.siMeshFamily) );
To find the name of a module for a given enum or constant