must conform with immutable rules contained within the DITA specification.
is not an open-slather, no-rules process. It is a formal, defined process with
The main requirements of
- You cannot make your
DITA less restrictive than the DITA
base content model.
- You cannot make a mandatory element
optional, and you cannot make a mandatory attribute optional.
- You cannot allow elements in positions
that are not allowed by the base content model.
- You cannot add new
element-specific attributes. You can only create new global attributes (or
attributes of elements in the base content model.