Excerpt is the term used by Confluence to describe the technique to render parts of one document within another document. The projectdoc Toolbox uses the term Transclusion for this technique.
A space blueprints is a tool to help users bootstrap the space creation process. From a dialog users select a space blueprint and create a new space with a basic, blueprint-specific set of pages.
Wiki Markup is a special syntax used in Confluence to describe pages. At specific locations this syntax is the only way to add macros. This is the only use case for this kind of markup in the context of the projectdoc Toolbox.
The projectdoc Toolbox provides a number of features to help teams to reuse content. Content can be transcluded individually or in form of a multitransclude. Authors can even transclude content from multiple documents in the wiki, effectively combining transclusion with automatic lists.