Prototype attributes are not yet implemented. There appears to only
be a small API, and then EOModeler support.
Relevant docs:
<http://developer.apple.com/documentation/LegacyTechnologies/
WebObjects/WebObjects_4.5/System/Documentation/Developer/
EnterpriseObjects/EOTools/Attributes2.html>
<http://developer.apple.com/documentation/LegacyTechnologies/
WebObjects/WebObjects_4.5/System/Library/Frameworks/
EOAccess.framework/ObjC_classic/Classes/EOAttribute.html>
<http://developer.apple.com/documentation/LegacyTechnologies/
WebObjects/WebObjects_4.5/System/Library/Frameworks/
EOAccess.framework/ObjC_classic/Classes/EOAdaptor.html>
