or
the character "!" followed by an element name, in which case the test
is negated.  The conditional passes if all the element conditions pass.
The tag expands the first sub-expression if the conditional passes, and
expands the second sub-expression otherwise.
For example, the format "%{?size,dpi,!pixelsize{pass}{fail}}" will expand
to "pass" if <TT
CLASS="PARAMETER"
><I
>pattern</I
></TT
> has size and dpi elements but
no pixelsize element, and to "fail" otherwise.&#13;</P
><P
>&#13;An <I
CLASS="FIRSTTERM