Many DITA attributes are reused in groups or are too complex
to describe in the usual table cell format. Those attributes are collected
in this section.
3.4.1 Commonly referenced attribute groups
Common attribute groups, such as the selection and property attributes of most DITA elements, are described here as sets in order to reduce unnecessary duplication of common information.
3.4.2 Complex attribute definitions
Several DITA attributes require more explanation than can fit in a single table cell. Those attributes are collected here.