WikiCarbon Classification System (WCS)

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(Compilation Overview)


The WikiCarbon Classification System ("WCS") is the indexing protocol for assigning one unique Assessment Identifier ("AI") to each Product Carbon Footprint (PCF) assessment posted to WikiCarbon. It relies on a basic adaptation of the Dewey Decimal System methodology to tag assessments based on product categories and subcategories. Assigning a unique AI to each PCF assessment posted on WikiCarbon makes it much easier for editors, viewers and other users to retrieve assessments and collaborate in compiling. Further, assigning an AI is required for assessments to be WikiCarbon-Compliant.

Rules for WikiCarbon-Compliance

In order to be WC-Compliant an assessment must:

  1. Have a complete Infobox in accordance with the Infobox (Guideline);
  2. Be category-tagged (following the WCS guidelines below);
  3. Be assigned a unique Assessment Identifier (following the WCS guidelines below);
  4. Honor Rule 1 (particularly, sub-rules 1 and 2) as detailed in the Rules section on the Streamlined PCF (Guideline); and
  5. Honor Steps 1 through 7 in the sub-section, "Start Contributing", of the Compilation (Guideline). As per step 5, this includes honoring all rules listed in the rules section of either the Streamlined or Product Standard guidelines.

Category tagging (Guideline)

Each PCF assessment (page) on WikiCarbon must be tagged with a category. Only pages that are category-tagged will be indexed and be made visible in drop-downs on product indexing pages.

How to category tag a page?

Tagging a page with a category is done by selecting "Edit" (Visual Editor) > then pressing the three bars symbol (for a drop-down of options) > selecting "Categories" > and typing in the Category (e.g., "French Press" or "Tops & Tees"). Category names must match actual index categories word-for-word.

Where to find the category name (word-for-word)?

The exact category name (or title) can be found on the left side-bar (with nested categories) which is always visible when using WikiCarbon. The left side-bar has every product category, category, and subcategory -- and further subcategory levels, if any, that are currently available for indexing on WikiCarbon.

Assessment Identifier (Guideline)

Each PCF assessment (page) on WikiCarbon must be assigned one unique identifier, called the Assessment Identifier ("WC-AI" or just "AI"). The AI is comprised of two parts: the Index Code, and a Unique Sequential Number -- both of which are separated by a single period ("."), the separator. The AI is listed at the bottom of every WikiCarbon-Compliant PCF pages in section: [X] Universal classifiers.

Index Code:

The Index Code is comprised of six digits, which are determined based on where on WikiCarbon the PCF assessment (page) is indexed. The first two digits correspond with the product category; the next two (middle) digits correspond with the Category ID, and the last two digits correspond with the first Subcategory ID. Together, they identify what product category (down to the sub-category) a PCF assessment belongs to, and where on WikiCarbon it's located.

## -- Product Category ID[1]

## -- Category ID[2]

## -- Subcategory ID[3]


This is simply a period "," placed between the index code and USN -- without any spaces (e.g., 123456.123).

Unique Sequential Number (USN):

This is the next unused whole number (i.e., increasing by +1) sequentially following the most recent PCF assessment posted to the same index code. See the section below regarding a Live index for AIs. Until the live index is set up, editors are not required to include the USN when entering the AI for a PCF assessment (the Index Code is sufficient).


What if there is a subcategory index table without an ID column?

If a subcategory table doesn't contain a column for Subcategory IDs, it's because this is a fourth-level subcategory and, as such, does not have an ID associated, as there are only three (3) levels of category indexing in the index code. The index code for any PCF assessment (page) that is tagged to a fourth- or fifth-level subcategory index page, corresponds with the Product Category ID, Category ID, and Subcategory ID -- that precedes said fourth- or fifth-level subcategory index page. This reflects the trade-off between granularity and ease-of-use.

Example: One instance where this does happen is: French Press, which is a fourth-level subcategory, following: Beverages > Coffee > Coffee Preparation Method > French Press. In this instance, the index code corresponds with the first three (3) category (index) levels (e.g., 243030 for Coffee Preparation Method). Another example is all Coffee Drinks (e.g., Americano, Cappuccino, Espresso), all of which have WC-AI: 243020.

What if a subcategory index should have an ID column?

If a subcategory table should, but doesn't have an ID column (such that there only exist a Product Category ID and Category ID) with which to enter the index code, then editors are to enter 00 for the Subcategory ID. This 00 is placeholder, until Subcategory IDs are prepared. The WCS is still being built out, given that WikiCarbon is in the beginning stages of development and compilation. That said, entering the partial index code will help administrators complete WC-AIs at a later point -- such that all PCF assessments (pages) are indexed correctly.

Live Index:

WikiCarbon is in the process of preparing a live index for Assessment Identifiers (AIs). This will be built primarily for editors to check all AIs currently in-use, at any point in time (live), to choose the next (unused) Unique Sequential Number (USN) to ensure they are using the next sequential AI associated with a particular Index Code. Until then, editors do not need to include a USN when preparing the AI; and only need to enter the index code for the AI. Entering the index code will help administrators complete the AIs at a later point; in order to index every PCF assessment.


  1. This corresponds with the product categories listed on the Products Index. For example, 24, for the product category: Beverages.
  2. This corresponds with the first set of subcategories within a product category. For example, 30, for the category: Coffee; which is within the Product Category: Beverages.
  3. This corresponds with subcategories within a product subcategory (i.e., the first set of product subcategories). For example, 20, for the subcategory: Coffee Drinks. Which is within the product subcategory: Coffee. The Index Code for all PCF assessments posted to any subcategory within Coffee Drinks is: 243020.