$IFNOTEMPTY$ object
[then-body]
[$ELSEIF$]
[else-body]
$END-IFNOTEMPTY$
Object is any macro name. If expansion of object returns non-empty string or list, then then-body is returned as the expansion of $IFNOTEMPTY$ macro. Otherwise the else-body is returned if any.
The then-body and else-body is any text that can appear inside macro body, which means also another macro call. Thus, $IFNOTEMPTY$ macro may be nested.
$IFNOTEMPTY$ $OVERLOAD-LINK-LIST$
Url = "$LIST-ITEM-LOCATION$_overloads+$MEMBER-EXT$"
$ELSEIF$
Url = "$vbdoc-filename$"
$END-IFNOTEMPTY$