# rootClass
ModuleBase

# baseClasses
Message extends ModuleBase
Module extends ModuleBase
Option extends ModuleBase
FormHandler extends ModuleBase

# baseMessageClasses
DebugMessage extends Message
ErrorMessage extends Message

# baseModules
DisplayModule extends Module
MailModule extends Module
ConfigModule extends Module

# optionalModules
DebugModule extends Module
EnvModule extends Module
RequiredModule extends Module
TemplateModule extends Module (dummy)
FieldCheckModule extends Module

# extendedModules
DisplayTemplateModule extends TemplateModule
MailTemplateModule extends TemplateModule
ErrorTemplateModule extends TemplateModule
ReplyTemplateModule extends TemplateModule

MailAttachModule extends MailModule

DutchCheckModule extends FieldCheckModule

# Extra classes that are included:
Content extends ModuleBase
Config extends ModuleBase
Vars extends ModuleBase
Template
Translator
CMailFile
XML