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this example, if the FILE keyword is omitted, default FILE(KEEP) is used.
However, if you hear the lines 2? FILE, 2.1, 2.1.1! (KEEP), and 2.1.1
(DELETE), the default option KEEP only applies to the next higher dotted
decimal number, 2.1 (which does not have an associated keyword), and
does not apply to 2? FILE. Nothing is used if the keyword FILE is omitted.
* Specifies a syntax element that can be repeated zero or more times. A
dotted decimal number followed by the * symbol indicates that this syntax
element can be used zero or more times; that is, it is optional and can be
repeated. For example, if you hear the line 5.1* data-area, you know that
you can include more than one data area or you can include none. If you
hear the lines 3*, 3 HOST, and 3 STATE, you know that you can include
HOST, STATE, both together, or nothing.
Notes:
1. If a dotted decimal number has an asterisk (*) next to it and there is
only one item with that dotted decimal number, you can repeat that
same item more than once.
2. If a dotted decimal number has an asterisk next to it and several items
have that dotted decimal number, you can use more than one item
from the list, but you cannot use the items more than once each. In the
previous example, you could write HOST STATE, but you could not write
HOST HOST.
3. The * symbol is equivalent to a loop-back line in a railroad syntax
diagram.
+ Specifies a syntax element that must be included one or more times. A
dotted decimal number followed by the + symbol indicates that this syntax
element must be included one or more times. For example, if you hear the
line 6.1+ data-area, you must include at least one data area. If you hear
the lines 2+, 2 HOST, and 2 STATE, you know that you must include HOST,
STATE, or both. As for the * symbol, you can only repeat a particular item if
it is the only item with that dotted decimal number. The + symbol, like the
* symbol, is equivalent to a loop-back line in a railroad syntax diagram.
Appendix. Accessibility A-3