1. sounds to me like you want to look under the setup tab in the backend, and edit your class. Usually, for the output or edit of a class the templates available would be enough, but if you want it any modified, you'd have to write override templates that apply specifically to your class.
2. If I remember correctly, eZFlow comes with a blog content type including the ability to add comments. If you want to allow commenting for registered users only, look into the user rights and edit the role of registered users. You can set which modules are available to which roles with what constraints.
For the blog comments I will look into ezflow. For a custom data type, I still wander if there isn't an easier way to do it. I already had discovered the possiblity to override templates based on class name of the node. But I will need to use this data type in a class with many attributes, and also later on in other classes. So it seems strange that I would have to create a class template just for one field... ezpublish must somehow build up the default class html from the html of the attributes that make the class... so isn't it somehow possible to just create templates for a single field?
no, you don't have to create a new class template if you just want to add a new data field to an existing class. (That is, unless you want to have that data field shown in view mode different from the standard template). If I'm getting it right, you just want to add a data field to an existing class? And its an existing datatype? eZ will take care of displaying the appropriate template then in the view and edit modes. Just add your new datafield in the class setup and have a look at it.
Good luck! Rainer
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