[sv-bc] is `end_keywords necessary?

If a `begin_keywords directive appears in a verilog source
text, does there have to be a corresponding `end_keywords?
The lrm examples suggest that there is always a matching
`end_keywords, but the lrm text itself doesn't explicitly
require it.  I actually don't see the need for an
`end_keywords, and requiring it just adds a burden to the
user.

Suppose I want to read some v2k files in sv mode.  It would
be convenient to do:

    verilog_tool -sv v2001.h file1.v file2.v ...

where v2001.h contains the one line:

    `begin_keywords "1364-2001"

without having to add a final end.h which contains just
`end_keywords.

Paul

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