The Document Type checkbox is to define if the node type should be a Document Type or not. If this checkbox is selected, the Sites Explorer considers such nodes as user content and applies the following behavior:
The View template will be used to display the DocumentType nodes.
The document types nodes can be created by the Add Content action. The forms shown in the Add Document action are the corresponding Dialog templates of each document type.
Non-document types are hidden unless the Show Non-document Nodes option is checked.
Templates are written using Groovy Templates and will require experiences with JCR API and HTML notions.