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824 bytes added ,  13:06, 27 March 2016
Added some quantity observations.
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** 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
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=== Generic approach ===
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=== 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)
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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.
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However it is possible to find some common approach. This is a first attempt.
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Some remarks:
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* product central - any quantity that is indicated is about the product and not the packaging;
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* equivalents - one or more equivalents might be available, i.e. in grams or liters, 24 cookies / 6 cookies in 4 packages;
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* containers - the generic toplevel package is a container;
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* subcontainers - a container might comprise multiple subcontainers (or even subsubcontainers) [hierarchy?]
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* (sub-)container synonyms - a user might container other words to describe a container, such as bottle, can, bag, etc.
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* 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);
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*
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* 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
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* 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.
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Test:
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=== 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"
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