constraint doldur {
		
		guard : self.satisfies('IllegalCharactersForName')
		
		check {
			if(self.ownedField.select(f | f.name = "Text").size() <> 1){
				var text = new TextField;
				text.name = "Text";
				text.displayName = "Text";
				self.ownedField.add(text);
			}
		
			if(self.ownedField.excludes(text)){
					return false;
			}
			return true;
		}
		
		message : 'laaaa'
	}