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708 bytes added ,  20:57, 21 December 2015
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** we can check that the conversion is well done if we have both values
 
** we can check that the conversion is well done if we have both values
 
** 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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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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* to indicate times, either a "*" or a "x" has been used;
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* the generic formula is: multiplier * quantity * size_unit units
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** multiplier indicates how often a quantity unit is used, i.e. 6 (25 cl bottles). This is a number.
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** quantity the size of the units in size_units, i.e. 25 (size) cl (size_unit) bottles (units). This is a number.
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** size_units is the unit for the size parameter, i.e. kg, ml or cl. This is an enumerated?
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** unit is the element the numbers and sizes refer to, i.e. pot, bottle, sack, etc.
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Examples:
    
== Countries ==
 
== Countries ==
3,393

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