Tariffs PSR

TL;DR

A utility library for formalising and working with product specific rules of origin. To use:

const psr = TariffPSR.parse('...', agreement.rulesOfOrigin, {hscode: '0101a01'});
console.log(formula.official);
console.log(formula.categories);
console.log(formula.dump());
console.log(formula.friendly(category));
console.log(formula.evaluate(...));
console.log(formula.iterate(...));

What

This is an example JavaScript library for working with product specific rules of origin of trade products. This is used in examples in combination with the DFAT Free Trade Agreement Portal Data.

This grammar and example module solves the problem of boolean algebra representation and evaluation of product specific rules of origin by machine in a consistent manner. The grammar is intended to be context-free and described in later section.

Who

This is intended for engineers who want to duplicate the FTA Portal RoO functionality.

Why

In international trade agreements, countries set up special product specific rules (PSRs) to determine whether certain products can be traded under said agreement. For example, certain products could be imported from one country, get combined or processed etc, and then exported to another country. PSR governs specifics of the rules and restrictions to determine if a product can be considered to be originating from a country.

These rules can be quite complex. Sometimes some rules can apply to all products. Sometimes, multiple rules need to apply at the same time in complex boolean relationships. This are mostly expressed in natural language.

This begs the question as to how to represent and reason about this data by machine. This grammar was designed to solve that problem.

In terms of applicability, existence and conformance is more important than specifics of the representation.

When

This particular example implementation will facilitate javascript and Nodejs users. This is developed to support the examples and use cases we had to implement to support our services.

Practitioners using other technologies and platforms are encouraged to treat this as one example implementation and develop their own implementations as necessary.

License

The MIT License (MIT)

Copyright (c) 2015-2016 National ICT Australia

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

How to Use

npm

npm install tariff-formula

html

Browserified code is checked into the repository as psr.js

Grammar

Alphabet

Use ASCII characters.

Tokens

• [A-Z0-9_]+ is a CODE
• ['][^']+['] is a TEXT
• ","
• "-"
• "silent"
• "parameter"
• "text"
• "except"
• "condition"
• "label"
• "details"
• "material"
• "extra"
• "("
• ")"
• "and"
• "or"

Rules

e
    : '(' e ')'
    | e 'and' e
    | e 'or' e
    | 'silent' e
    | CODE
    | e 'parameter' TEXT
    | e 'text' TEXT
    | e 'condition' TEXT
    | e 'label' TEXT
    | e 'except' exc
    | e 'details' TEXT

exc
    : exc ',' exc
    | CODE '-' CODE
    | CODE
    | exc material TEXT
    | exc extra TEXT

Start

e

Notes

All whitespace characters between terminals are ignored.

Jison is used for implementation. See src/grammar.jison for more details.

PSR logic is simulated with boolean algebra.

'silent' fields are for incorporating implicit logic. e.g. hidden de minimis rules.

'text' is for custom text representation that does not follow standard pattern.

'except' is for documenting a list of exceptions the code does not apply for

'condition' for documenting conditions

Examples

• WO
• CC or silent CTH and RVC parameter '50'
• WO except 01
• WO except 01-02
• WO except 01 material 'mammals' - 02, 03 extra 'alive only'

Modification

Dependencies

sudo npm install -g babel-cli
sudo npm install -g browserify
sudo npm install -g jison
sudo npm install -g nodemon

Sources

In src folder.

Run

npm run grammar

to compile jison grammar file into js. I.e. grammar.js

Run

npm run workDev

to automatically compile files in src folder into es6 commonjs modules in root folder. I.e. index.js and test.js

Run

npm run browserify

to prepare commonjs files for browser. I.e. psr.js