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Added some quantity observations.
** we can display the value in several metrics if we have a sanitized value in one metric
** we can display the value in several metrics if we have a sanitized value in one metric
=== Generic approach ===
=== Canonical approach ===
The real-world quantities for products as used by the users us a far from ideal. However it is possible to find some common approach. (At least we try here)
The real-world quantities for products as used by the user (and printed on the packages) is not ideal. It is often impossible to parse the quantities and understand what is indicated.
However it is possible to find some common approach. This is a first attempt.
Some remarks:
* product central - any quantity that is indicated is about the product and not the packaging;
* equivalents - one or more equivalents might be available, i.e. in grams or liters, 24 cookies / 6 cookies in 4 packages;
* containers - the generic toplevel package is a container;
* subcontainers - a container might comprise multiple subcontainers (or even subsubcontainers) [hierarchy?]
* (sub-)container synonyms - a user might container other words to describe a container, such as bottle, can, bag, etc.
* defaults - in indicating the quantity some parts are assumed to be understood. If it states 33cl it is assumed to be about the container (the bottle) and the product (beer);
*
* to indicate times, either a "*" or a "x" can be used;
* to indicate times, either a "*" or a "x" can be used;
* the generic formula is: multiplier * quantity size_unit for units
* the generic formula is: multiplier * quantity size_unit for units
* naturally users do not use this formal approach, but most quantities can be translated to this approach.
* naturally users do not use this formal approach, but most quantities can be translated to this approach.
Test:
=== Test approach ===
To test this approach the examples found in France have translated to this formal approach:
To test this approach the examples found in France have translated to this formal approach:
{| class="wikitable sortable"
{| class="wikitable sortable"