Document types (or doctypes for short) define a set of properties and sections. Each doctype matches at least one Confluence Page Blueprint. Confluence Page Blueprints are a collection of templates, but often the collection contains only one element.
A document type is a logical concept, while a page blueprint is an implementation of a document type in Confluence. We use the terms page blueprint and template often interchangeably and always refer to the implementation that is the basis for creating a new document of a given type. Strictly speaking a page blueprint may contain a collection of templates. Often the collection contains only one template.
The document itself is sometimes called document instance to distinguish it from the document type.
A projectdoc document is a Confluence page with properties and sections. Every projectdoc document is a Confluence page, but it is not required that every Confluence page is a projectdoc document. Confluence pages that are not projectdoc documents are not take into account for searches (for example with the Display Table Macro) by the projectdoc add-on.
projectdoc specifies a simple property called Doctype to define the document type for a document instance. The property is part of the Document Properties Marker Macro that is required on the top of every projectdoc document. In addition to the property, a Confluence page also requires a label with the document type's value.
