Testing References
Reference with content [1]
Re-usage of the base reference [1]
Extension based on previous reference [1.1]
Another reference where the content is in the reflist [2]
A sub-reference where the parent is in the reflist but not used anywhere on it's own. [3.1]
Reference in a group [group 1]
Extension in a group [group 2.1]
Reuse of an extension in a group [group 2.1]