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\DOC issymb
\TYPE {issymb : string -> bool}
\SYNOPSIS
Tests if a one-character string is a symbol other than bracket or separator.
\DESCRIBE
The call {issymb s} tests whether the first character of string {s} (normally
it is the only character) is ``symbolic''. This means that it is one of the
usual ASCII characters but is not alphanumeric, not an underscore or prime
character, and is also not one of the two separators `{,}' or `{;}' nor any
bracket, parenthesis or curly brace. More explicitly, the set of symbolic
characters is:
{
\ ! @ # $ % ^ & * - + | \ \ < = > / ? ~ . :
}
\FAILURE
Fails if the string is empty.
\SEEALSO
isalnum, isalpha, isbra, isnum, issep, isspace.
\ENDDOC
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