The <citetitle> tag provides formatting for a
specific references (title can be manually typed out or if already
defined within your document set, given as an entity[1]
).
For example:
<citetitle>IG;</citetitle>.
The output looks like Installation Guide because &IG; is an entity.
[1] An entity is a short hand way of referring to another manual or guide. It can be defined within the parent document or within a set of files that your DTD references for your specific documentation set.