Hannu Krosing writes:
> > <table contents source> ::=
> > <table element list>
> > | OF <user-defined type>
> > [ <subtable clause> ]
> > [ <table element list> ]
> to me it seems that only this is OR-d : <table element list> | OF
> <user-defined type>
>
> and the rest ([ <subtable clause> ],[ <table element list> ])is just
> optional
Nope. In that case it would read
<table contents source> ::=
{ <table element list>
| OF <user-defined type> }
[ <subtable clause> ]
[ <table element list> ]
because ISO/IEC 9075-1:1999 section 6.1 says:
| The alternative operator. The vertical bar indicates that the
portion of the formula following the bar is an alternative
to the portion preceding the bar. If the vertical bar appears
at a position where it is not enclosed in braces or square
brackets, it specifies a complete alternative for the element
defined by the production rule. If the vertical bar appears
in a portion of a formula enclosed in braces or square
brackets, it specifies alternatives for the contents of the
innermost pair of such braces or brackets.
--
Peter Eisentraut peter_e@gmx.net http://yi.org/peter-e/
