1.1 Notation
1.1 Notation
A particular variant of EBNF (Extended Bachus Naur Form)
will be used to describe the FunnelWeb syntax. In this variant,
literal strings are delimited by double quotes (e.g. "string"),
optional constructs by square brackets (e.g. [optional]), and
constructs repeated zero or more times by braces (e.g.
{zeroormore}). Constructs to be repeated a fixed number of
times are enclosed in braces followed by a decimal number
indicating the number of times to be repeated (e.g.
1 Introduction
{sixtimes}6). Constructs to be repeated one or more times are
2 Interface
enclosed in braces and followed by a + (e.g. {oneormore}+).
3 Scanner
The traditional BNF "
" is replaced by the visually simpler
4 Parser
". The traditional BNF angle brackets are abandoned.
5 Analyser
Although FunnelWeb allows the special character to be
6 Tangle
changed using the construct "=", use of "" to
7 Weave
refer to FunnelWeb s special character is cumbersome and
8 Shell
abstract. To simplify the presentation, the default special
9 Commands
character "
" is used throughout this chapter to represent the
10 Glossary
special character.
11 References
Copyright   Ross N. Williams 1992,1999. All rights
http://www.ross.net/funnelweb/reference/intro_notation.html [3/3/2000 10:49:06 PM]

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