The projectdoc Toolbox provides a number of standard categories that are supported by all doctypes.

Each document instance of these types provide a section named 'Documents' that lists all documents associated with a given category.

Typically all doctypes provide a property named 'Type' to reference an instance of a doctype type document. These types are doctype-specific. That is in contrast to the standard categories shown above that are provided by all doctypes, these doctype-specific types are only supported by a single doctype.

Type doctypes typically also provide a section named 'Documents' to list documents of the given type.

All doctypes can be used to categorize documents. The use of Role or Experience Level may seem more natural to categorize documents than Resource or Stakeholder. But ist it basically depends on the information model which categories make sense and which do not.